diff --git a/src/app/applicationinstancemanager.h b/src/app/applicationinstancemanager.h
index 4a04fd1c7..236696911 100644
--- a/src/app/applicationinstancemanager.h
+++ b/src/app/applicationinstancemanager.h
@@ -51,6 +51,6 @@ signals:
     void messageReceived(const QString &message);
 
 private:
-    QtLocalPeer *m_peer;
+    QtLocalPeer *m_peer = nullptr;
     const bool m_isFirstInstance;
 };
diff --git a/src/app/cmdoptions.cpp b/src/app/cmdoptions.cpp
index ef0bceb6d..6275224f1 100644
--- a/src/app/cmdoptions.cpp
+++ b/src/app/cmdoptions.cpp
@@ -97,7 +97,7 @@ namespace
         }
 
     private:
-        const char *m_name;
+        const char *m_name = nullptr;
         const char m_shortcut;
     };
 
diff --git a/src/base/bittorrent/filterparserthread.cpp b/src/base/bittorrent/filterparserthread.cpp
index bdd8cf11f..eb599fa6b 100644
--- a/src/base/bittorrent/filterparserthread.cpp
+++ b/src/base/bittorrent/filterparserthread.cpp
@@ -48,7 +48,7 @@ namespace
             unsigned char octetIndex = 0;
 
             const char *octetStart = str;
-            char *endptr;
+            char *endptr = nullptr;
             for (; *str; ++str)
             {
                 if (*str == '.')
diff --git a/src/base/bittorrent/portforwarderimpl.h b/src/base/bittorrent/portforwarderimpl.h
index f2574815b..5d04f86fe 100644
--- a/src/base/bittorrent/portforwarderimpl.h
+++ b/src/base/bittorrent/portforwarderimpl.h
@@ -58,6 +58,6 @@ private:
     void stop();
 
     CachedSettingValue<bool> m_storeActive;
-    lt::session *m_provider;
+    lt::session *m_provider = nullptr;
     QHash<quint16, std::vector<lt::port_mapping_t>> m_mappedPorts;
 };
diff --git a/src/base/bittorrent/torrentimpl.h b/src/base/bittorrent/torrentimpl.h
index 80b297252..1f975072d 100644
--- a/src/base/bittorrent/torrentimpl.h
+++ b/src/base/bittorrent/torrentimpl.h
@@ -288,8 +288,8 @@ namespace BitTorrent
 
         nonstd::expected<lt::entry, QString> exportTorrent() const;
 
-        Session *const m_session;
-        lt::session *m_nativeSession;
+        Session *const m_session = nullptr;
+        lt::session *m_nativeSession = nullptr;
         lt::torrent_handle m_nativeHandle;
         mutable lt::torrent_status m_nativeStatus;
         TorrentState m_state = TorrentState::Unknown;
diff --git a/src/base/bittorrent/tracker.h b/src/base/bittorrent/tracker.h
index 6e502c075..bc9de5edc 100644
--- a/src/base/bittorrent/tracker.h
+++ b/src/base/bittorrent/tracker.h
@@ -103,7 +103,7 @@ namespace BitTorrent
         void unregisterPeer(const TrackerAnnounceRequest &announceReq);
         void prepareAnnounceResponse(const TrackerAnnounceRequest &announceReq);
 
-        Http::Server *m_server;
+        Http::Server *m_server = nullptr;
         Http::Request m_request;
         Http::Environment m_env;
 
diff --git a/src/base/http/connection.h b/src/base/http/connection.h
index 062f7bdb1..5b8f67a78 100644
--- a/src/base/http/connection.h
+++ b/src/base/http/connection.h
@@ -57,8 +57,8 @@ namespace Http
         void read();
         void sendResponse(const Response &response) const;
 
-        QTcpSocket *m_socket;
-        IRequestHandler *m_requestHandler;
+        QTcpSocket *m_socket = nullptr;
+        IRequestHandler *m_requestHandler = nullptr;
         QByteArray m_receivedData;
         QElapsedTimer m_idleTimer;
     };
diff --git a/src/base/http/server.cpp b/src/base/http/server.cpp
index e7395de61..f53e437d7 100644
--- a/src/base/http/server.cpp
+++ b/src/base/http/server.cpp
@@ -74,7 +74,6 @@ using namespace Http;
 Server::Server(IRequestHandler *requestHandler, QObject *parent)
     : QTcpServer(parent)
     , m_requestHandler(requestHandler)
-    , m_https(false)
 {
     setProxy(QNetworkProxy::NoProxy);
 
@@ -91,7 +90,7 @@ void Server::incomingConnection(const qintptr socketDescriptor)
 {
     if (m_connections.size() >= CONNECTIONS_LIMIT) return;
 
-    QTcpSocket *serverSocket;
+    QTcpSocket *serverSocket = nullptr;
     if (m_https)
         serverSocket = new QSslSocket(this);
     else
diff --git a/src/base/http/server.h b/src/base/http/server.h
index 26efb6c28..57bed673f 100644
--- a/src/base/http/server.h
+++ b/src/base/http/server.h
@@ -58,10 +58,10 @@ namespace Http
         void incomingConnection(qintptr socketDescriptor) override;
         void removeConnection(Connection *connection);
 
-        IRequestHandler *m_requestHandler;
+        IRequestHandler *m_requestHandler = nullptr;
         QSet<Connection *> m_connections;  // for tracking persistent connections
 
-        bool m_https;
+        bool m_https = false;
         QList<QSslCertificate> m_certificates;
         QSslKey m_key;
     };
diff --git a/src/base/net/geoipdatabase.cpp b/src/base/net/geoipdatabase.cpp
index 0379e83fa..c548e7c0b 100644
--- a/src/base/net/geoipdatabase.cpp
+++ b/src/base/net/geoipdatabase.cpp
@@ -76,13 +76,7 @@ struct DataFieldDescriptor
 };
 
 GeoIPDatabase::GeoIPDatabase(const quint32 size)
-    : m_ipVersion(0)
-    , m_recordSize(0)
-    , m_nodeCount(0)
-    , m_nodeSize(0)
-    , m_indexSize(0)
-    , m_recordBytes(0)
-    , m_size(size)
+    : m_size(size)
     , m_data(new uchar[size])
 {
 }
diff --git a/src/base/net/geoipdatabase.h b/src/base/net/geoipdatabase.h
index 3d9495c10..9e02fda7e 100644
--- a/src/base/net/geoipdatabase.h
+++ b/src/base/net/geoipdatabase.h
@@ -73,16 +73,16 @@ private:
     template <typename T> QVariant readPlainValue(quint32 &offset, quint8 len) const;
 
     // Metadata
-    quint16 m_ipVersion;
-    quint16 m_recordSize;
-    quint32 m_nodeCount;
-    int m_nodeSize;
-    int m_indexSize;
-    int m_recordBytes;
+    quint16 m_ipVersion = 0;
+    quint16 m_recordSize = 0;
+    quint32 m_nodeCount = 0;
+    int m_nodeSize = 0;
+    int m_indexSize = 0;
+    int m_recordBytes = 0;
     QDateTime m_buildEpoch;
     QString m_dbType;
     // Search data
     mutable QHash<quint32, QString> m_countries;
-    quint32 m_size;
-    uchar *m_data;
+    quint32 m_size = 0;
+    uchar *m_data = nullptr;
 };
diff --git a/src/base/net/geoipmanager.cpp b/src/base/net/geoipmanager.cpp
index 62e2d447d..caebdf97c 100644
--- a/src/base/net/geoipmanager.cpp
+++ b/src/base/net/geoipmanager.cpp
@@ -54,8 +54,6 @@ using namespace Net;
 GeoIPManager *GeoIPManager::m_instance = nullptr;
 
 GeoIPManager::GeoIPManager()
-    : m_enabled(false)
-    , m_geoIPDatabase(nullptr)
 {
     configure();
     connect(Preferences::instance(), &Preferences::changed, this, &GeoIPManager::configure);
diff --git a/src/base/net/geoipmanager.h b/src/base/net/geoipmanager.h
index 69d238636..a5652d5f5 100644
--- a/src/base/net/geoipmanager.h
+++ b/src/base/net/geoipmanager.h
@@ -66,8 +66,8 @@ namespace Net
         void manageDatabaseUpdate();
         void downloadDatabaseFile();
 
-        bool m_enabled;
-        GeoIPDatabase *m_geoIPDatabase;
+        bool m_enabled = false;
+        GeoIPDatabase *m_geoIPDatabase = nullptr;
 
         static GeoIPManager *m_instance;
     };
diff --git a/src/base/net/smtp.cpp b/src/base/net/smtp.cpp
index ab105e89e..4fd96f68a 100644
--- a/src/base/net/smtp.cpp
+++ b/src/base/net/smtp.cpp
@@ -103,9 +103,6 @@ using namespace Net;
 
 Smtp::Smtp(QObject *parent)
     : QObject(parent)
-    , m_state(Init)
-    , m_useSsl(false)
-    , m_authType(AuthPlain)
 {
     static bool needToRegisterMetaType = true;
 
diff --git a/src/base/net/smtp.h b/src/base/net/smtp.h
index 42ec689e1..28c7cadeb 100644
--- a/src/base/net/smtp.h
+++ b/src/base/net/smtp.h
@@ -103,18 +103,18 @@ namespace Net
 
         QByteArray m_message;
 #ifndef QT_NO_OPENSSL
-        QSslSocket *m_socket;
+        QSslSocket *m_socket = nullptr;
 #else
-        QTcpSocket *m_socket;
+        QTcpSocket *m_socket = nullptr;
 #endif
         QString m_from;
         QString m_rcpt;
         QString m_response;
-        int m_state;
+        int m_state = Init;
         QHash<QString, QString> m_extensions;
         QByteArray m_buffer;
-        bool m_useSsl;
-        AuthType m_authType;
+        bool m_useSsl = false;
+        AuthType m_authType = AuthPlain;
         QString m_username;
         QString m_password;
     };
diff --git a/src/base/rss/rss_autodownloader.h b/src/base/rss/rss_autodownloader.h
index 9813087d6..1b54f443e 100644
--- a/src/base/rss/rss_autodownloader.h
+++ b/src/base/rss/rss_autodownloader.h
@@ -136,9 +136,9 @@ namespace RSS
         SettingValue<QVariant> m_storeSmartEpisodeFilter;
         SettingValue<bool> m_storeDownloadRepacks;
 
-        QTimer *m_processingTimer;
-        QThread *m_ioThread;
-        AsyncFileStorage *m_fileStorage;
+        QTimer *m_processingTimer = nullptr;
+        QThread *m_ioThread = nullptr;
+        AsyncFileStorage *m_fileStorage = nullptr;
         QHash<QString, AutoDownloadRule> m_rules;
         QList<QSharedPointer<ProcessingJob>> m_processingQueue;
         QHash<QString, QSharedPointer<ProcessingJob>> m_waitingJobs;
diff --git a/src/base/rss/rss_session.h b/src/base/rss/rss_session.h
index b69001206..cb7f9ac99 100644
--- a/src/base/rss/rss_session.h
+++ b/src/base/rss/rss_session.h
@@ -158,9 +158,9 @@ namespace RSS
         CachedSettingValue<bool> m_storeProcessingEnabled;
         CachedSettingValue<int> m_storeRefreshInterval;
         CachedSettingValue<int> m_storeMaxArticlesPerFeed;
-        QThread *m_workingThread;
-        AsyncFileStorage *m_confFileStorage;
-        AsyncFileStorage *m_dataFileStorage;
+        QThread *m_workingThread = nullptr;
+        AsyncFileStorage *m_confFileStorage = nullptr;
+        AsyncFileStorage *m_dataFileStorage = nullptr;
         QTimer m_refreshTimer;
         QHash<QString, Item *> m_itemsByPath;
         QHash<QUuid, Feed *> m_feedsByUID;
diff --git a/src/base/search/searchdownloadhandler.h b/src/base/search/searchdownloadhandler.h
index adb9dc6f7..4fa51a43c 100644
--- a/src/base/search/searchdownloadhandler.h
+++ b/src/base/search/searchdownloadhandler.h
@@ -49,6 +49,6 @@ signals:
 private:
     void downloadProcessFinished(int exitcode);
 
-    SearchPluginManager *m_manager;
-    QProcess *m_downloadProcess;
+    SearchPluginManager *m_manager = nullptr;
+    QProcess *m_downloadProcess = nullptr;
 };
diff --git a/src/base/search/searchhandler.h b/src/base/search/searchhandler.h
index 2f42b1bca..bda41fe89 100644
--- a/src/base/search/searchhandler.h
+++ b/src/base/search/searchhandler.h
@@ -83,9 +83,9 @@ private:
     const QString m_pattern;
     const QString m_category;
     const QStringList m_usedPlugins;
-    SearchPluginManager *m_manager;
-    QProcess *m_searchProcess;
-    QTimer *m_searchTimeout;
+    SearchPluginManager *m_manager = nullptr;
+    QProcess *m_searchProcess = nullptr;
+    QTimer *m_searchTimeout = nullptr;
     QByteArray m_searchResultLineTruncated;
     bool m_searchCancelled = false;
     QList<SearchResult> m_results;
diff --git a/src/base/utils/io.h b/src/base/utils/io.h
index d0be5089a..06a2d71e1 100644
--- a/src/base/utils/io.h
+++ b/src/base/utils/io.h
@@ -76,9 +76,9 @@ namespace Utils::IO
         }
 
     private:
-        QFileDevice *m_device;
+        QFileDevice *m_device = nullptr;
         std::shared_ptr<QByteArray> m_buffer;
-        int m_bufferSize;
+        int m_bufferSize = 0;
     };
 
     nonstd::expected<void, QString> saveToFile(const Path &path, const QByteArray &data);
diff --git a/src/base/utils/random.cpp b/src/base/utils/random.cpp
index b4fc21756..3ca907665 100644
--- a/src/base/utils/random.cpp
+++ b/src/base/utils/random.cpp
@@ -125,7 +125,7 @@ namespace
         }
 
     private:
-        FILE *m_randDev;
+        FILE *m_randDev = nullptr;
     };
 #endif
 }
diff --git a/src/gui/aboutdialog.h b/src/gui/aboutdialog.h
index 609f24992..2ac58617b 100644
--- a/src/gui/aboutdialog.h
+++ b/src/gui/aboutdialog.h
@@ -47,6 +47,6 @@ public:
     ~AboutDialog() override;
 
 private:
-    Ui::AboutDialog *m_ui;
+    Ui::AboutDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
 };
diff --git a/src/gui/addnewtorrentdialog.h b/src/gui/addnewtorrentdialog.h
index 747844f1b..3eeeb7624 100644
--- a/src/gui/addnewtorrentdialog.h
+++ b/src/gui/addnewtorrentdialog.h
@@ -115,7 +115,7 @@ private:
 
     void showEvent(QShowEvent *event) override;
 
-    Ui::AddNewTorrentDialog *m_ui;
+    Ui::AddNewTorrentDialog *m_ui = nullptr;
     TorrentContentFilterModel *m_contentModel = nullptr;
     PropListDelegate *m_contentDelegate = nullptr;
     BitTorrent::MagnetUri m_magnetURI;
diff --git a/src/gui/autoexpandabledialog.h b/src/gui/autoexpandabledialog.h
index db5d0ea5d..a77cf83bb 100644
--- a/src/gui/autoexpandabledialog.h
+++ b/src/gui/autoexpandabledialog.h
@@ -55,5 +55,5 @@ protected:
     void showEvent(QShowEvent *e) override;
 
 private:
-    Ui::AutoExpandableDialog *m_ui;
+    Ui::AutoExpandableDialog *m_ui = nullptr;
 };
diff --git a/src/gui/banlistoptionsdialog.h b/src/gui/banlistoptionsdialog.h
index 54abffe6c..4f2c3a461 100644
--- a/src/gui/banlistoptionsdialog.h
+++ b/src/gui/banlistoptionsdialog.h
@@ -56,9 +56,9 @@ private slots:
     void on_txtIP_textChanged(const QString &ip);
 
 private:
-    Ui::BanListOptionsDialog *m_ui;
+    Ui::BanListOptionsDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
-    QStringListModel *m_model;
-    QSortFilterProxyModel *m_sortFilter;
+    QStringListModel *m_model = nullptr;
+    QSortFilterProxyModel *m_sortFilter = nullptr;
     bool m_modified = false;
 };
diff --git a/src/gui/categoryfiltermodel.cpp b/src/gui/categoryfiltermodel.cpp
index 36ab44ccc..5a054c49c 100644
--- a/src/gui/categoryfiltermodel.cpp
+++ b/src/gui/categoryfiltermodel.cpp
@@ -40,8 +40,6 @@ class CategoryModelItem
 {
 public:
     CategoryModelItem()
-        : m_parent(nullptr)
-        , m_torrentsCount(0)
     {
     }
 
@@ -154,9 +152,9 @@ public:
     }
 
 private:
-    CategoryModelItem *m_parent;
+    CategoryModelItem *m_parent = nullptr;
     QString m_name;
-    int m_torrentsCount;
+    int m_torrentsCount = 0;
     QHash<QString, CategoryModelItem *> m_children;
     QStringList m_childUids;
 };
diff --git a/src/gui/categoryfiltermodel.h b/src/gui/categoryfiltermodel.h
index 51f5859df..bade1f6ce 100644
--- a/src/gui/categoryfiltermodel.h
+++ b/src/gui/categoryfiltermodel.h
@@ -75,5 +75,5 @@ private:
     CategoryModelItem *findItem(const QString &fullName) const;
 
     bool m_isSubcategoriesEnabled;
-    CategoryModelItem *m_rootItem;
+    CategoryModelItem *m_rootItem = nullptr;
 };
diff --git a/src/gui/cookiesdialog.h b/src/gui/cookiesdialog.h
index b70bbfc54..5b8b39ab7 100644
--- a/src/gui/cookiesdialog.h
+++ b/src/gui/cookiesdialog.h
@@ -56,8 +56,8 @@ private slots:
     void onButtonDeleteClicked();
 
 private:
-    Ui::CookiesDialog *m_ui;
-    CookiesModel *m_cookiesModel;
+    Ui::CookiesDialog *m_ui = nullptr;
+    CookiesModel *m_cookiesModel = nullptr;
 
     SettingValue<QSize> m_storeDialogSize;
     SettingValue<QByteArray> m_storeViewState;
diff --git a/src/gui/deletionconfirmationdialog.h b/src/gui/deletionconfirmationdialog.h
index e65fe9a45..f93f1746b 100644
--- a/src/gui/deletionconfirmationdialog.h
+++ b/src/gui/deletionconfirmationdialog.h
@@ -53,5 +53,5 @@ private slots:
     void on_rememberBtn_clicked();
 
 private:
-    Ui::DeletionConfirmationDialog *m_ui;
+    Ui::DeletionConfirmationDialog *m_ui = nullptr;
 };
diff --git a/src/gui/downloadfromurldialog.h b/src/gui/downloadfromurldialog.h
index d6394313e..4687e2703 100644
--- a/src/gui/downloadfromurldialog.h
+++ b/src/gui/downloadfromurldialog.h
@@ -53,6 +53,6 @@ private slots:
     void downloadButtonClicked();
 
 private:
-    Ui::DownloadFromURLDialog *m_ui;
+    Ui::DownloadFromURLDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
 };
diff --git a/src/gui/executionlogwidget.h b/src/gui/executionlogwidget.h
index 99e52ec61..b8c65b690 100644
--- a/src/gui/executionlogwidget.h
+++ b/src/gui/executionlogwidget.h
@@ -55,6 +55,6 @@ public:
 private:
     void displayContextMenu(const LogListView *view, const BaseLogModel *model) const;
 
-    Ui::ExecutionLogWidget *m_ui;
-    LogFilterModel *m_messageFilterModel;
+    Ui::ExecutionLogWidget *m_ui = nullptr;
+    LogFilterModel *m_messageFilterModel = nullptr;
 };
diff --git a/src/gui/fspathedit.cpp b/src/gui/fspathedit.cpp
index 38724c767..a2c7b1491 100644
--- a/src/gui/fspathedit.cpp
+++ b/src/gui/fspathedit.cpp
@@ -46,8 +46,8 @@ namespace
 {
     struct TrStringWithComment
     {
-        const char *source;
-        const char *comment;
+        const char *source = nullptr;
+        const char *comment = nullptr;
 
         QString tr() const
         {
@@ -76,15 +76,15 @@ class FileSystemPathEdit::FileSystemPathEditPrivate
     void browseActionTriggered();
     QString dialogCaptionOrDefault() const;
 
-    FileSystemPathEdit *q_ptr;
+    FileSystemPathEdit *q_ptr = nullptr;
     std::unique_ptr<Private::FileEditorWithCompletion> m_editor;
-    QAction *m_browseAction;
-    QToolButton *m_browseBtn;
+    QAction *m_browseAction = nullptr;
+    QToolButton *m_browseBtn = nullptr;
     QString m_fileNameFilter;
     Mode m_mode;
     Path m_lastSignaledPath;
     QString m_dialogCaption;
-    Private::FileSystemPathValidator *m_validator;
+    Private::FileSystemPathValidator *m_validator = nullptr;
 };
 
 FileSystemPathEdit::FileSystemPathEditPrivate::FileSystemPathEditPrivate(
diff --git a/src/gui/fspathedit.h b/src/gui/fspathedit.h
index 2f697544c..772714f47 100644
--- a/src/gui/fspathedit.h
+++ b/src/gui/fspathedit.h
@@ -111,7 +111,7 @@ private:
 
     QWidget *editWidgetImpl() const;
 
-    FileSystemPathEditPrivate *d_ptr;
+    FileSystemPathEditPrivate *d_ptr = nullptr;
 };
 
 /// Widget which uses QLineEdit for path editing
diff --git a/src/gui/fspathedit_p.h b/src/gui/fspathedit_p.h
index 28c858852..3a512177d 100644
--- a/src/gui/fspathedit_p.h
+++ b/src/gui/fspathedit_p.h
@@ -138,11 +138,11 @@ namespace Private
         static QString warningText(FileSystemPathValidator::TestResult r);
         void showCompletionPopup();
 
-        QFileSystemModel *m_completerModel;
-        QCompleter *m_completer;
-        QAction *m_browseAction;
+        QFileSystemModel *m_completerModel = nullptr;
+        QCompleter *m_completer = nullptr;
+        QAction *m_browseAction = nullptr;
+        QAction *m_warningAction = nullptr;
         QFileIconProvider m_iconProvider;
-        QAction *m_warningAction;
     };
 
     class FileComboEdit final : public QComboBox, public FileEditorWithCompletion
diff --git a/src/gui/ipsubnetwhitelistoptionsdialog.h b/src/gui/ipsubnetwhitelistoptionsdialog.h
index e0cd412fc..2b9538ac7 100644
--- a/src/gui/ipsubnetwhitelistoptionsdialog.h
+++ b/src/gui/ipsubnetwhitelistoptionsdialog.h
@@ -56,10 +56,10 @@ private slots:
     void on_txtIPSubnet_textChanged(const QString &subnetStr);
 
 private:
-    Ui::IPSubnetWhitelistOptionsDialog *m_ui;
+    Ui::IPSubnetWhitelistOptionsDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
 
-    QStringListModel *m_model;
-    QSortFilterProxyModel *m_sortFilter;
+    QStringListModel *m_model = nullptr;
+    QSortFilterProxyModel *m_sortFilter = nullptr;
     bool m_modified = false;
 };
diff --git a/src/gui/lineedit.h b/src/gui/lineedit.h
index 856fcc569..03d72cf8d 100644
--- a/src/gui/lineedit.h
+++ b/src/gui/lineedit.h
@@ -26,5 +26,5 @@ protected:
     void keyPressEvent(QKeyEvent *event) override;
 
 private:
-    QToolButton *m_searchButton;
+    QToolButton *m_searchButton = nullptr;
 };
diff --git a/src/gui/mainwindow.h b/src/gui/mainwindow.h
index de402ae2b..0d9c7e58f 100644
--- a/src/gui/mainwindow.h
+++ b/src/gui/mainwindow.h
@@ -219,9 +219,9 @@ private:
     void showStatusBar(bool show);
     void showFiltersSidebar(bool show);
 
-    Ui::MainWindow *m_ui;
+    Ui::MainWindow *m_ui = nullptr;
 
-    QFileSystemWatcher *m_executableWatcher;
+    QFileSystemWatcher *m_executableWatcher = nullptr;
     // GUI related
     bool m_posInitialized = false;
     QPointer<QTabWidget> m_tabs;
@@ -237,27 +237,27 @@ private:
 #endif
     QPointer<QMenu> m_trayIconMenu;
 
-    TransferListWidget *m_transferListWidget;
+    TransferListWidget *m_transferListWidget = nullptr;
     TransferListFiltersWidget *m_transferListFiltersWidget = nullptr;
-    PropertiesWidget *m_propertiesWidget;
-    bool m_displaySpeedInTitle;
+    PropertiesWidget *m_propertiesWidget = nullptr;
+    bool m_displaySpeedInTitle = false;
     bool m_forceExit = false;
-    bool m_uiLocked;
+    bool m_uiLocked = false;
     bool m_unlockDlgShowing = false;
-    LineEdit *m_searchFilter;
-    QAction *m_searchFilterAction;
+    LineEdit *m_searchFilter = nullptr;
+    QAction *m_searchFilterAction = nullptr;
     // Widgets
-    QAction *m_queueSeparator;
-    QAction *m_queueSeparatorMenu;
-    QSplitter *m_splitter;
+    QAction *m_queueSeparator = nullptr;
+    QAction *m_queueSeparatorMenu = nullptr;
+    QSplitter *m_splitter = nullptr;
     QPointer<SearchWidget> m_searchWidget;
     QPointer<RSSWidget> m_rssWidget;
     QPointer<ExecutionLogWidget> m_executionLog;
     // Power Management
-    PowerManagement *m_pwr;
-    QTimer *m_preventTimer;
+    PowerManagement *m_pwr = nullptr;
+    QTimer *m_preventTimer = nullptr;
     bool m_hasPython = false;
-    QMenu *m_toolbarMenu;
+    QMenu *m_toolbarMenu = nullptr;
 
     SettingValue<bool> m_storeExecutionLogEnabled;
     SettingValue<bool> m_storeDownloadTrackerFavicon;
diff --git a/src/gui/optionsdialog.h b/src/gui/optionsdialog.h
index c15b0a3dd..b15dd434c 100644
--- a/src/gui/optionsdialog.h
+++ b/src/gui/optionsdialog.h
@@ -177,14 +177,14 @@ private:
 
     bool schedTimesOk();
 
-    Ui::OptionsDialog *m_ui;
+    Ui::OptionsDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
     SettingValue<QStringList> m_storeHSplitterSize;
     SettingValue<int> m_storeLastViewedPage;
 
-    QPushButton *m_applyButton;
+    QPushButton *m_applyButton = nullptr;
 
-    AdvancedSettings *m_advancedSettings;
+    AdvancedSettings *m_advancedSettings = nullptr;
 
     bool m_refreshingIpFilter = false;
 };
diff --git a/src/gui/powermanagement/powermanagement.h b/src/gui/powermanagement/powermanagement.h
index d817e2a24..0ef9fbfe4 100644
--- a/src/gui/powermanagement/powermanagement.h
+++ b/src/gui/powermanagement/powermanagement.h
@@ -58,7 +58,7 @@ private:
   bool m_busy = false;
 
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)) && defined(QT_DBUS_LIB)
-  PowerManagementInhibitor *m_inhibitor;
+  PowerManagementInhibitor *m_inhibitor = nullptr;
 #endif
 #ifdef Q_OS_MACOS
   IOPMAssertionID m_assertionID;
diff --git a/src/gui/previewselectdialog.h b/src/gui/previewselectdialog.h
index 010cb25d5..76a42bad7 100644
--- a/src/gui/previewselectdialog.h
+++ b/src/gui/previewselectdialog.h
@@ -78,10 +78,10 @@ private:
     void loadWindowState();
     void saveWindowState();
 
-    Ui::PreviewSelectDialog *m_ui;
-    QStandardItemModel *m_previewListModel;
-    PreviewListDelegate *m_listDelegate;
-    const BitTorrent::Torrent *m_torrent;
+    Ui::PreviewSelectDialog *m_ui = nullptr;
+    QStandardItemModel *m_previewListModel = nullptr;
+    PreviewListDelegate *m_listDelegate = nullptr;
+    const BitTorrent::Torrent *m_torrent = nullptr;
     bool m_headerStateInitialized = false;
 
     // Settings
diff --git a/src/gui/properties/peersadditiondialog.h b/src/gui/properties/peersadditiondialog.h
index 6033d31e8..a778ccb39 100644
--- a/src/gui/properties/peersadditiondialog.h
+++ b/src/gui/properties/peersadditiondialog.h
@@ -53,6 +53,6 @@ protected slots:
     void validateInput();
 
 private:
-    Ui::PeersAdditionDialog *m_ui;
+    Ui::PeersAdditionDialog *m_ui = nullptr;
     QVector<BitTorrent::PeerAddress> m_peersList;
 };
diff --git a/src/gui/properties/propertieswidget.cpp b/src/gui/properties/propertieswidget.cpp
index a6c21caa4..8ff8a791f 100644
--- a/src/gui/properties/propertieswidget.cpp
+++ b/src/gui/properties/propertieswidget.cpp
@@ -73,8 +73,6 @@
 PropertiesWidget::PropertiesWidget(QWidget *parent)
     : QWidget(parent)
     , m_ui(new Ui::PropertiesWidget())
-    , m_torrent(nullptr)
-    , m_handleWidth(-1)
 {
     m_ui->setupUi(this);
     setAutoFillBackground(true);
diff --git a/src/gui/properties/propertieswidget.h b/src/gui/properties/propertieswidget.h
index 7f9a208b3..8dcff78f4 100644
--- a/src/gui/properties/propertieswidget.h
+++ b/src/gui/properties/propertieswidget.h
@@ -112,18 +112,18 @@ private:
     void openParentFolder(const QModelIndex &index) const;
     Path getFullPath(const QModelIndex &index) const;
 
-    Ui::PropertiesWidget *m_ui;
-    BitTorrent::Torrent *m_torrent;
+    Ui::PropertiesWidget *m_ui = nullptr;
+    BitTorrent::Torrent *m_torrent = nullptr;
     SlideState m_state;
-    TorrentContentFilterModel *m_propListModel;
-    PropListDelegate *m_propListDelegate;
-    PeerListWidget *m_peerList;
-    TrackerListWidget *m_trackerList;
+    TorrentContentFilterModel *m_propListModel = nullptr;
+    PropListDelegate *m_propListDelegate = nullptr;
+    PeerListWidget *m_peerList = nullptr;
+    TrackerListWidget *m_trackerList = nullptr;
     QWidget *m_speedWidget = nullptr;
     QList<int> m_slideSizes;
-    DownloadedPiecesBar *m_downloadedPieces;
-    PieceAvailabilityBar *m_piecesAvailability;
-    PropTabBar *m_tabBar;
-    LineEdit *m_contentFilterLine;
-    int m_handleWidth;
+    DownloadedPiecesBar *m_downloadedPieces = nullptr;
+    PieceAvailabilityBar *m_piecesAvailability = nullptr;
+    PropTabBar *m_tabBar = nullptr;
+    LineEdit *m_contentFilterLine = nullptr;
+    int m_handleWidth = -1;
 };
diff --git a/src/gui/properties/proplistdelegate.h b/src/gui/properties/proplistdelegate.h
index dca97146d..1db613224 100644
--- a/src/gui/properties/proplistdelegate.h
+++ b/src/gui/properties/proplistdelegate.h
@@ -69,6 +69,6 @@ signals:
     void filteredFilesChanged() const;
 
 private:
-    PropertiesWidget *m_properties;
+    PropertiesWidget *m_properties = nullptr;
     ProgressBarPainter m_progressBarPainter;
 };
diff --git a/src/gui/properties/proptabbar.cpp b/src/gui/properties/proptabbar.cpp
index 200849ac0..aeb6f26a7 100644
--- a/src/gui/properties/proptabbar.cpp
+++ b/src/gui/properties/proptabbar.cpp
@@ -38,7 +38,6 @@
 
 PropTabBar::PropTabBar(QWidget *parent)
     : QHBoxLayout(parent)
-    , m_currentIndex(-1)
 {
     setAlignment(Qt::AlignLeft | Qt::AlignCenter);
     setSpacing(3);
diff --git a/src/gui/properties/proptabbar.h b/src/gui/properties/proptabbar.h
index c68e1df1d..5bcc34851 100644
--- a/src/gui/properties/proptabbar.h
+++ b/src/gui/properties/proptabbar.h
@@ -60,6 +60,6 @@ public slots:
     void setCurrentIndex(int index);
 
 private:
-    QButtonGroup *m_btnGroup;
-    int m_currentIndex;
+    QButtonGroup *m_btnGroup = nullptr;
+    int m_currentIndex = -1;
 };
diff --git a/src/gui/properties/speedwidget.h b/src/gui/properties/speedwidget.h
index 97d17192b..948077c18 100644
--- a/src/gui/properties/speedwidget.h
+++ b/src/gui/properties/speedwidget.h
@@ -49,7 +49,7 @@ public:
     void showPopup() override;
 
 private:
-    QMenu *m_menu;
+    QMenu *m_menu = nullptr;
 };
 
 
@@ -71,13 +71,13 @@ private:
     void loadSettings();
     void saveSettings() const;
 
-    QVBoxLayout *m_layout;
-    QHBoxLayout *m_hlayout;
-    QLabel *m_periodLabel;
-    QComboBox *m_periodCombobox;
-    SpeedPlotView *m_plot;
+    QVBoxLayout *m_layout = nullptr;
+    QHBoxLayout *m_hlayout = nullptr;
+    QLabel *m_periodLabel = nullptr;
+    QComboBox *m_periodCombobox = nullptr;
+    SpeedPlotView *m_plot = nullptr;
 
-    ComboBoxMenuButton *m_graphsButton;
-    QMenu *m_graphsMenu;
+    ComboBoxMenuButton *m_graphsButton = nullptr;
+    QMenu *m_graphsMenu = nullptr;
     QList<QAction *> m_graphsMenuActions;
 };
diff --git a/src/gui/properties/trackerlistwidget.h b/src/gui/properties/trackerlistwidget.h
index e2bdcb452..26c94a8db 100644
--- a/src/gui/properties/trackerlistwidget.h
+++ b/src/gui/properties/trackerlistwidget.h
@@ -91,9 +91,9 @@ private:
 
     static QStringList headerLabels();
 
-    PropertiesWidget *m_properties;
+    PropertiesWidget *m_properties = nullptr;
     QHash<QString, QTreeWidgetItem *> m_trackerItems;
-    QTreeWidgetItem *m_DHTItem;
-    QTreeWidgetItem *m_PEXItem;
-    QTreeWidgetItem *m_LSDItem;
+    QTreeWidgetItem *m_DHTItem = nullptr;
+    QTreeWidgetItem *m_PEXItem = nullptr;
+    QTreeWidgetItem *m_LSDItem = nullptr;
 };
diff --git a/src/gui/properties/trackersadditiondialog.h b/src/gui/properties/trackersadditiondialog.h
index b1ac9f773..90cf233ae 100644
--- a/src/gui/properties/trackersadditiondialog.h
+++ b/src/gui/properties/trackersadditiondialog.h
@@ -65,6 +65,6 @@ public slots:
     void torrentListDownloadFinished(const Net::DownloadResult &result);
 
 private:
-    Ui::TrackersAdditionDialog *m_ui;
-    BitTorrent::Torrent *const m_torrent;
+    Ui::TrackersAdditionDialog *m_ui = nullptr;
+    BitTorrent::Torrent *const m_torrent = nullptr;
 };
diff --git a/src/gui/rss/automatedrssdownloader.h b/src/gui/rss/automatedrssdownloader.h
index 304f33b8b..b9f2dc7f8 100644
--- a/src/gui/rss/automatedrssdownloader.h
+++ b/src/gui/rss/automatedrssdownloader.h
@@ -101,12 +101,12 @@ private:
     const QString m_formatFilterJSON;
     const QString m_formatFilterLegacy;
 
-    Ui::AutomatedRssDownloader *m_ui;
-    QListWidgetItem *m_currentRuleItem;
+    Ui::AutomatedRssDownloader *m_ui = nullptr;
+    QListWidgetItem *m_currentRuleItem = nullptr;
     QSet<std::pair<QString, QString>> m_treeListEntries;
     RSS::AutoDownloadRule m_currentRule;
     QHash<QString, QListWidgetItem *> m_itemsByRuleName;
-    QRegularExpression *m_episodeRegex;
+    QRegularExpression *m_episodeRegex = nullptr;
 
     SettingValue<QSize> m_storeDialogSize;
     SettingValue<QByteArray> m_storeHSplitterSize;
diff --git a/src/gui/rss/feedlistwidget.h b/src/gui/rss/feedlistwidget.h
index 569011a8c..e1b603de5 100644
--- a/src/gui/rss/feedlistwidget.h
+++ b/src/gui/rss/feedlistwidget.h
@@ -71,5 +71,5 @@ private:
     void fill(QTreeWidgetItem *parent, RSS::Folder *rssParent);
 
     QHash<RSS::Item *, QTreeWidgetItem *> m_rssToTreeItemMapping;
-    QTreeWidgetItem *m_unreadStickyItem;
+    QTreeWidgetItem *m_unreadStickyItem = nullptr;
 };
diff --git a/src/gui/rss/htmlbrowser.h b/src/gui/rss/htmlbrowser.h
index 3fac84b11..b503f257a 100644
--- a/src/gui/rss/htmlbrowser.h
+++ b/src/gui/rss/htmlbrowser.h
@@ -47,8 +47,8 @@ public:
     QVariant loadResource(int type, const QUrl &name) override;
 
 protected:
-    QNetworkAccessManager *m_netManager;
-    QNetworkDiskCache *m_diskCache;
+    QNetworkAccessManager *m_netManager = nullptr;
+    QNetworkDiskCache *m_diskCache = nullptr;
     QHash<QUrl, bool> m_activeRequests;
 
 protected slots:
diff --git a/src/gui/rss/rsswidget.h b/src/gui/rss/rsswidget.h
index 444044457..9d1f296a0 100644
--- a/src/gui/rss/rsswidget.h
+++ b/src/gui/rss/rsswidget.h
@@ -82,7 +82,7 @@ private slots:
     void handleUnreadCountChanged();
 
 private:
-    Ui::RSSWidget *m_ui;
-    ArticleListWidget *m_articleListWidget;
-    FeedListWidget *m_feedListWidget;
+    Ui::RSSWidget *m_ui = nullptr;
+    ArticleListWidget *m_articleListWidget = nullptr;
+    FeedListWidget *m_feedListWidget = nullptr;
 };
diff --git a/src/gui/search/pluginselectdialog.h b/src/gui/search/pluginselectdialog.h
index 1ff280a13..29df65a33 100644
--- a/src/gui/search/pluginselectdialog.h
+++ b/src/gui/search/pluginselectdialog.h
@@ -91,9 +91,9 @@ private:
     void finishAsyncOp();
     void finishPluginUpdate();
 
-    Ui::PluginSelectDialog *m_ui;
+    Ui::PluginSelectDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
-    SearchPluginManager *m_pluginManager;
+    SearchPluginManager *m_pluginManager = nullptr;
     QStringList m_updatedPlugins;
     int m_asyncOps = 0;
     int m_pendingUpdates = 0;
diff --git a/src/gui/search/pluginsourcedialog.h b/src/gui/search/pluginsourcedialog.h
index d5d8a1695..e930fde3e 100644
--- a/src/gui/search/pluginsourcedialog.h
+++ b/src/gui/search/pluginsourcedialog.h
@@ -55,6 +55,6 @@ private slots:
     void on_urlButton_clicked();
 
 private:
-    Ui::PluginSourceDialog *m_ui;
+    Ui::PluginSourceDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
 };
diff --git a/src/gui/search/searchjobwidget.h b/src/gui/search/searchjobwidget.h
index e4818a5df..46a608864 100644
--- a/src/gui/search/searchjobwidget.h
+++ b/src/gui/search/searchjobwidget.h
@@ -130,11 +130,11 @@ private:
 
     static QString statusText(Status st);
 
-    Ui::SearchJobWidget *m_ui;
-    SearchHandler *m_searchHandler;
-    QStandardItemModel *m_searchListModel;
-    SearchSortModel *m_proxyModel;
-    LineEdit *m_lineEditSearchResultsFilter;
+    Ui::SearchJobWidget *m_ui = nullptr;
+    SearchHandler *m_searchHandler = nullptr;
+    QStandardItemModel *m_searchListModel = nullptr;
+    SearchSortModel *m_proxyModel = nullptr;
+    LineEdit *m_lineEditSearchResultsFilter = nullptr;
     Status m_status = Status::Ongoing;
     bool m_noSearchResults = true;
 
diff --git a/src/gui/search/searchwidget.cpp b/src/gui/search/searchwidget.cpp
index 91d9a762c..4d19eba2e 100644
--- a/src/gui/search/searchwidget.cpp
+++ b/src/gui/search/searchwidget.cpp
@@ -87,7 +87,6 @@ SearchWidget::SearchWidget(MainWindow *mainWindow)
     : QWidget(mainWindow)
     , m_ui(new Ui::SearchWidget())
     , m_mainWindow(mainWindow)
-    , m_isNewQueryString(false)
 {
     m_ui->setupUi(this);
     m_ui->tabWidget->tabBar()->installEventFilter(this);
diff --git a/src/gui/search/searchwidget.h b/src/gui/search/searchwidget.h
index fccd46dc7..e1e9bca18 100644
--- a/src/gui/search/searchwidget.h
+++ b/src/gui/search/searchwidget.h
@@ -78,10 +78,10 @@ private:
     QString selectedCategory() const;
     QString selectedPlugin() const;
 
-    Ui::SearchWidget *m_ui;
+    Ui::SearchWidget *m_ui = nullptr;
     QPointer<SearchJobWidget> m_currentSearchTab; // Selected tab
     QPointer<SearchJobWidget> m_activeSearchTab; // Tab with running search
     QList<SearchJobWidget *> m_allTabs; // To store all tabs
-    MainWindow *m_mainWindow;
-    bool m_isNewQueryString;
+    MainWindow *m_mainWindow = nullptr;
+    bool m_isNewQueryString = false;
 };
diff --git a/src/gui/shutdownconfirmdialog.cpp b/src/gui/shutdownconfirmdialog.cpp
index 99f1643fc..dd1f9ecb9 100644
--- a/src/gui/shutdownconfirmdialog.cpp
+++ b/src/gui/shutdownconfirmdialog.cpp
@@ -45,7 +45,6 @@ using namespace std::chrono_literals;
 ShutdownConfirmDialog::ShutdownConfirmDialog(QWidget *parent, const ShutdownDialogAction &action)
     : QDialog(parent)
     , m_ui(new Ui::ShutdownConfirmDialog)
-    , m_timeout(15)
     , m_action(action)
 {
     m_ui->setupUi(this);
diff --git a/src/gui/shutdownconfirmdialog.h b/src/gui/shutdownconfirmdialog.h
index b5d7f5d26..8211681b9 100644
--- a/src/gui/shutdownconfirmdialog.h
+++ b/src/gui/shutdownconfirmdialog.h
@@ -62,9 +62,9 @@ private:
     void updateText();
 
     // Vars
-    Ui::ShutdownConfirmDialog *m_ui;
+    Ui::ShutdownConfirmDialog *m_ui = nullptr;
     QTimer m_timer;
-    int m_timeout;
+    int m_timeout = 15;
     ShutdownDialogAction m_action;
     QString m_msg;
 };
diff --git a/src/gui/speedlimitdialog.h b/src/gui/speedlimitdialog.h
index e30e8ea0e..557114e60 100644
--- a/src/gui/speedlimitdialog.h
+++ b/src/gui/speedlimitdialog.h
@@ -50,7 +50,7 @@ public slots:
     void accept() override;
 
 private:
-    Ui::SpeedLimitDialog *m_ui;
+    Ui::SpeedLimitDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
     struct
     {
diff --git a/src/gui/stacktracedialog.h b/src/gui/stacktracedialog.h
index 034dc948a..823b8ac8f 100644
--- a/src/gui/stacktracedialog.h
+++ b/src/gui/stacktracedialog.h
@@ -48,5 +48,5 @@ public:
     void setText(const QString &signalName, const QString &stacktrace);
 
 private:
-    Ui::StacktraceDialog *m_ui;
+    Ui::StacktraceDialog *m_ui = nullptr;
 };
diff --git a/src/gui/statsdialog.h b/src/gui/statsdialog.h
index 4f0e890d9..bbb3deab0 100644
--- a/src/gui/statsdialog.h
+++ b/src/gui/statsdialog.h
@@ -50,6 +50,6 @@ private slots:
     void update();
 
 private:
-    Ui::StatsDialog *m_ui;
+    Ui::StatsDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
 };
diff --git a/src/gui/statusbar.h b/src/gui/statusbar.h
index 3cdcae6ec..3d9354faf 100644
--- a/src/gui/statusbar.h
+++ b/src/gui/statusbar.h
@@ -64,9 +64,9 @@ private:
     void updateDHTNodesNumber();
     void updateSpeedLabels();
 
-    QPushButton *m_dlSpeedLbl;
-    QPushButton *m_upSpeedLbl;
-    QLabel *m_DHTLbl;
-    QPushButton *m_connecStatusLblIcon;
-    QPushButton *m_altSpeedsBtn;
+    QPushButton *m_dlSpeedLbl = nullptr;
+    QPushButton *m_upSpeedLbl = nullptr;
+    QLabel *m_DHTLbl = nullptr;
+    QPushButton *m_connecStatusLblIcon = nullptr;
+    QPushButton *m_altSpeedsBtn = nullptr;
 };
diff --git a/src/gui/torrentcategorydialog.h b/src/gui/torrentcategorydialog.h
index 889226a2f..6a1e315a8 100644
--- a/src/gui/torrentcategorydialog.h
+++ b/src/gui/torrentcategorydialog.h
@@ -65,6 +65,6 @@ private slots:
     void useDownloadPathChanged(int index);
 
 private:
-    Ui::TorrentCategoryDialog *m_ui;
+    Ui::TorrentCategoryDialog *m_ui = nullptr;
     Path m_lastEnteredDownloadPath;
 };
diff --git a/src/gui/torrentcontentfiltermodel.h b/src/gui/torrentcontentfiltermodel.h
index f475e1aee..a70bcab14 100644
--- a/src/gui/torrentcontentfiltermodel.h
+++ b/src/gui/torrentcontentfiltermodel.h
@@ -62,6 +62,6 @@ protected:
 private:
     bool hasFiltered(const QModelIndex &folder) const;
 
-    TorrentContentModel *m_model;
+    TorrentContentModel *m_model = nullptr;
     Utils::Compare::NaturalLessThan<Qt::CaseInsensitive> m_naturalLessThan;
 };
diff --git a/src/gui/torrentcontentmodel.cpp b/src/gui/torrentcontentmodel.cpp
index 4663007e1..d0ce0371c 100644
--- a/src/gui/torrentcontentmodel.cpp
+++ b/src/gui/torrentcontentmodel.cpp
@@ -438,7 +438,7 @@ QModelIndex TorrentContentModel::index(int row, int column, const QModelIndex &p
     if (column >= TorrentContentModelItem::NB_COL)
         return {};
 
-    TorrentContentModelFolder *parentItem;
+    TorrentContentModelFolder *parentItem = nullptr;
     if (!parent.isValid())
         parentItem = m_rootItem;
     else
@@ -475,7 +475,7 @@ int TorrentContentModel::rowCount(const QModelIndex &parent) const
     if (parent.column() > 0)
         return 0;
 
-    TorrentContentModelFolder *parentItem;
+    TorrentContentModelFolder *parentItem = nullptr;
     if (!parent.isValid())
         parentItem = m_rootItem;
     else
diff --git a/src/gui/torrentcontentmodelitem.cpp b/src/gui/torrentcontentmodelitem.cpp
index ae14a2d60..2c2e00d3f 100644
--- a/src/gui/torrentcontentmodelitem.cpp
+++ b/src/gui/torrentcontentmodelitem.cpp
@@ -37,11 +37,6 @@
 
 TorrentContentModelItem::TorrentContentModelItem(TorrentContentModelFolder *parent)
     : m_parentItem(parent)
-    , m_size(0)
-    , m_remaining(0)
-    , m_priority(BitTorrent::DownloadPriority::Normal)
-    , m_progress(0)
-    , m_availability(-1.)
 {
 }
 
diff --git a/src/gui/torrentcontentmodelitem.h b/src/gui/torrentcontentmodelitem.h
index 6cf1dadcb..27a33a4ad 100644
--- a/src/gui/torrentcontentmodelitem.h
+++ b/src/gui/torrentcontentmodelitem.h
@@ -84,14 +84,14 @@ public:
     int row() const;
 
 protected:
-    TorrentContentModelFolder *m_parentItem;
+    TorrentContentModelFolder *m_parentItem = nullptr;
     // Root item members
     QVector<QString> m_itemData;
     // Non-root item members
     QString m_name;
-    qulonglong m_size;
-    qulonglong m_remaining;
-    BitTorrent::DownloadPriority m_priority;
-    qreal m_progress;
-    qreal m_availability;
+    qulonglong m_size = 0;
+    qulonglong m_remaining = 0;
+    BitTorrent::DownloadPriority m_priority = BitTorrent::DownloadPriority::Normal;
+    qreal m_progress = 0;
+    qreal m_availability = -1;
 };
diff --git a/src/gui/torrentcreatordialog.h b/src/gui/torrentcreatordialog.h
index 9b6228f49..4f032c2cf 100644
--- a/src/gui/torrentcreatordialog.h
+++ b/src/gui/torrentcreatordialog.h
@@ -74,8 +74,8 @@ private:
     int getPaddedFileSizeLimit() const;
 #endif
 
-    Ui::TorrentCreatorDialog *m_ui;
-    BitTorrent::TorrentCreatorThread *m_creatorThread;
+    Ui::TorrentCreatorDialog *m_ui = nullptr;
+    BitTorrent::TorrentCreatorThread *m_creatorThread = nullptr;
 
     // settings
     SettingValue<QSize> m_storeDialogSize;
diff --git a/src/gui/torrentoptionsdialog.h b/src/gui/torrentoptionsdialog.h
index 0291fe9e9..3af01777f 100644
--- a/src/gui/torrentoptionsdialog.h
+++ b/src/gui/torrentoptionsdialog.h
@@ -75,7 +75,7 @@ private:
     int getSeedingTime() const;
 
     QVector<BitTorrent::TorrentID> m_torrentIDs;
-    Ui::TorrentOptionsDialog *m_ui;
+    Ui::TorrentOptionsDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
     QStringList m_categories;
     QString m_currentCategoriesString;
diff --git a/src/gui/trackerentriesdialog.h b/src/gui/trackerentriesdialog.h
index f2380f205..b4882fe7b 100644
--- a/src/gui/trackerentriesdialog.h
+++ b/src/gui/trackerentriesdialog.h
@@ -59,6 +59,6 @@ private:
     void saveSettings();
     void loadSettings();
 
-    Ui::TrackerEntriesDialog *m_ui;
+    Ui::TrackerEntriesDialog *m_ui = nullptr;
     SettingValue<QSize> m_storeDialogSize;
 };
diff --git a/src/gui/transferlistfilterswidget.h b/src/gui/transferlistfilterswidget.h
index 9b78ab651..32c5ba6be 100644
--- a/src/gui/transferlistfilterswidget.h
+++ b/src/gui/transferlistfilterswidget.h
@@ -66,7 +66,7 @@ public slots:
     void toggleFilter(bool checked);
 
 protected:
-    TransferListWidget *transferList;
+    TransferListWidget *transferList = nullptr;
 
 private slots:
     virtual void showMenu() = 0;
@@ -190,8 +190,8 @@ private:
     void toggleCategoryFilter(bool enabled);
     void toggleTagFilter(bool enabled);
 
-    TransferListWidget *m_transferList;
-    TrackerFiltersList *m_trackerFilters;
-    CategoryFilterWidget *m_categoryFilterWidget;
-    TagFilterWidget *m_tagFilterWidget;
+    TransferListWidget *m_transferList = nullptr;
+    TrackerFiltersList *m_trackerFilters = nullptr;
+    CategoryFilterWidget *m_categoryFilterWidget = nullptr;
+    TagFilterWidget *m_tagFilterWidget = nullptr;
 };
diff --git a/src/gui/transferlistwidget.h b/src/gui/transferlistwidget.h
index c30e09c20..51caeee7d 100644
--- a/src/gui/transferlistwidget.h
+++ b/src/gui/transferlistwidget.h
@@ -131,7 +131,7 @@ private:
     QVector<BitTorrent::Torrent *> getVisibleTorrents() const;
     int visibleColumnsCount() const;
 
-    TransferListModel *m_listModel;
-    TransferListSortModel *m_sortFilterModel;
-    MainWindow *m_mainWindow;
+    TransferListModel *m_listModel = nullptr;
+    TransferListSortModel *m_sortFilterModel = nullptr;
+    MainWindow *m_mainWindow = nullptr;
 };
diff --git a/src/gui/tristateaction.h b/src/gui/tristateaction.h
index 4c4ccb5a2..b442cd335 100644
--- a/src/gui/tristateaction.h
+++ b/src/gui/tristateaction.h
@@ -54,5 +54,5 @@ public:
     void setCloseOnInteraction(bool enabled);
 
 private:
-    TriStateWidget *m_triStateWidget;
+    TriStateWidget *m_triStateWidget = nullptr;
 };
diff --git a/src/gui/watchedfolderoptionsdialog.h b/src/gui/watchedfolderoptionsdialog.h
index 4dacc8d6b..4292b5001 100644
--- a/src/gui/watchedfolderoptionsdialog.h
+++ b/src/gui/watchedfolderoptionsdialog.h
@@ -57,7 +57,7 @@ private:
     void onTMMChanged(int index);
     void onCategoryChanged(int index);
 
-    Ui::WatchedFolderOptionsDialog *m_ui;
+    Ui::WatchedFolderOptionsDialog *m_ui = nullptr;
     Path m_savePath;
     Path m_downloadPath;
     bool m_useDownloadPath = false;
diff --git a/src/gui/watchedfoldersmodel.h b/src/gui/watchedfoldersmodel.h
index 368fbd8cf..4ffd1778e 100644
--- a/src/gui/watchedfoldersmodel.h
+++ b/src/gui/watchedfoldersmodel.h
@@ -62,7 +62,7 @@ private:
     void onFolderSet(const Path &path, const TorrentFilesWatcher::WatchedFolderOptions &options);
     void onFolderRemoved(const Path &path);
 
-    TorrentFilesWatcher *m_fsWatcher;
+    TorrentFilesWatcher *m_fsWatcher = nullptr;
     PathList m_watchedFolders;
     QHash<Path, TorrentFilesWatcher::WatchedFolderOptions> m_watchedFoldersOptions;
     QSet<Path> m_deletedFolders;