diff --git a/src/GUI.cpp b/src/GUI.cpp
index 2be703e3a..eac69c0bc 100644
--- a/src/GUI.cpp
+++ b/src/GUI.cpp
@@ -578,6 +578,7 @@ void GUI::updateDlList(bool force){
           if(BTSession->getTorrentsToPauseAfterChecking().indexOf(fileHash) == -1){
             DLListModel->setData(DLListModel->index(row, NAME), QVariant(QIcon(":/Icons/time.png")), Qt::DecorationRole);
             setRowColor(row, "grey");
+            Q_ASSERT(torrentStatus.progress <= 1.);
             DLListModel->setData(DLListModel->index(row, PROGRESS), QVariant((double)torrentStatus.progress));
           }
           break;
@@ -592,6 +593,7 @@ void GUI::updateDlList(bool force){
             DLListModel->setData(DLListModel->index(row, NAME), QVariant(QIcon(":/Icons/skin/connecting.png")), Qt::DecorationRole);
             setRowColor(row, "grey");
           }
+          Q_ASSERT(torrentStatus.progress <= 1.);
           DLListModel->setData(DLListModel->index(row, PROGRESS), QVariant((double)torrentStatus.progress));
           DLListModel->setData(DLListModel->index(row, DLSPEED), QVariant((double)torrentStatus.download_payload_rate));
           DLListModel->setData(DLListModel->index(row, UPSPEED), QVariant((double)torrentStatus.upload_payload_rate));
@@ -608,6 +610,7 @@ void GUI::updateDlList(bool force){
             DLListModel->setData(DLListModel->index(row, ETA), QVariant((qlonglong)-1));
             setRowColor(row, "black");
           }
+          Q_ASSERT(torrentStatus.progress <= 1.);
           DLListModel->setData(DLListModel->index(row, PROGRESS), QVariant((double)torrentStatus.progress));
           DLListModel->setData(DLListModel->index(row, DLSPEED), QVariant((double)torrentStatus.download_payload_rate));
           DLListModel->setData(DLListModel->index(row, UPSPEED), QVariant((double)torrentStatus.upload_payload_rate));
@@ -1222,6 +1225,7 @@ void GUI::updateFileSizeAndProgress(QString hash){
   DLListModel->setData(DLListModel->index(row, SIZE), QVariant((qlonglong)BTSession->torrentEffectiveSize(hash)));
   torrent_handle h = BTSession->getTorrentHandle(hash);
   torrent_status torrentStatus = h.status();
+  Q_ASSERT(torrentStatus.progress <= 1.);
   DLListModel->setData(DLListModel->index(row, PROGRESS), QVariant((double)torrentStatus.progress));
 }
 
@@ -1629,6 +1633,7 @@ void GUI::torrentChecked(QString hash){
       DLListModel->setData(DLListModel->index(row, NAME), QIcon(":/Icons/skin/paused.png"), Qt::DecorationRole);
       setRowColor(row, "red");
       // Update progress in download list
+      Q_ASSERT(torrentStatus.progress <= 1.);
       DLListModel->setData(DLListModel->index(row, PROGRESS), QVariant((double)torrentStatus.progress));
       // Delayed Sorting
       sortProgressColumnDelayed();