Synchronizing access to database

app/src/main/java/acr/browser/lightning/database/bookmark/BookmarkDatabase.java

@@ -75,7 +75,7 @@ public class BookmarkDatabase extends SQLiteOpenHelper implements BookmarkModel
      */
     @WorkerThread
     @NonNull
-    private SQLiteDatabase lazyDatabase() {
+    private synchronized SQLiteDatabase lazyDatabase() {
         if (mDatabase == null || !mDatabase.isOpen()) {
             mDatabase = getWritableDatabase();
         }

app/src/main/java/acr/browser/lightning/database/downloads/DownloadsDatabase.java

@@ -68,7 +68,7 @@ public class DownloadsDatabase extends SQLiteOpenHelper implements DownloadsMode
      */
     @WorkerThread
     @NonNull
-    private SQLiteDatabase lazyDatabase() {
+    private synchronized SQLiteDatabase lazyDatabase() {
         if (mDatabase == null || !mDatabase.isOpen()) {
             mDatabase = getWritableDatabase();
         }

app/src/main/java/acr/browser/lightning/database/history/HistoryDatabase.java

@@ -92,7 +92,7 @@ public class HistoryDatabase extends SQLiteOpenHelper implements HistoryModel {
 
     @WorkerThread
     @NonNull
-    private SQLiteDatabase lazyDatabase() {
+    private synchronized SQLiteDatabase lazyDatabase() {
         if (mDatabase == null || !mDatabase.isOpen()) {
             mDatabase = this.getWritableDatabase();
         }