3 files changed, 16 insertions, 9 deletions
diff --git a/src/modlistsortproxy.cpp b/src/modlistsortproxy.cpp
index f646a079..39631b67 100644
--- a/src/modlistsortproxy.cpp
+++ b/src/modlistsortproxy.cpp
@@ -21,6 +21,7 @@ along with Mod Organizer.  If not, see <http://www.gnu.org/licenses/>.
 #include "modinfo.h"
 #include "profile.h"
 #include "messagedialog.h"
+#include "qtgroupingproxy.h"
 #include <QMenu>
 #include <QCheckBox>
 #include <QWidgetAction>
@@ -362,7 +363,7 @@ bool ModListSortProxy::dropMimeData(const QMimeData *data, Qt::DropAction action
     return false;
   }
   if ((row == -1) && (column == -1)) {
-    return this->sourceModel()->dropMimeData(data, action, -1, -1, mapToSource(parent));
+    return sourceModel()->dropMimeData(data, action, -1, -1, mapToSource(parent));
   }
   // in the regular model, when dropping between rows, the row-value passed to
   // the sourceModel is inconsistent between ascending and descending ordering.
@@ -380,9 +381,12 @@ bool ModListSortProxy::dropMimeData(const QMimeData *data, Qt::DropAction action
 void ModListSortProxy::setSourceModel(QAbstractItemModel *sourceModel)
 {
   QSortFilterProxyModel::setSourceModel(sourceModel);
-
-  connect(sourceModel, SIGNAL(aboutToChangeData()), this, SLOT(aboutToChangeData()));
-  connect(sourceModel, SIGNAL(postDataChanged()), this, SLOT(postDataChanged()));
+  QtGroupingProxy *proxy = qobject_cast<QtGroupingProxy*>(sourceModel);
+  if (proxy != nullptr) {
+    sourceModel = proxy->sourceModel();
+  }
+  connect(sourceModel, SIGNAL(aboutToChangeData()), this, SLOT(aboutToChangeData()), Qt::UniqueConnection);
+  connect(sourceModel, SIGNAL(postDataChanged()), this, SLOT(postDataChanged()), Qt::UniqueConnection);
 }
 
 void ModListSortProxy::aboutToChangeData()
diff --git a/src/qtgroupingproxy.cpp b/src/qtgroupingproxy.cpp
index c5ee8591..5fcb84d3 100644
--- a/src/qtgroupingproxy.cpp
+++ b/src/qtgroupingproxy.cpp
@@ -877,9 +877,12 @@ QtGroupingProxy::dropMimeData(const QMimeData *data, Qt::DropAction action, int
     QModelIndex newIdx = mapToSource(index(max, column, idx));
     return sourceModel()->dropMimeData(data, action, max, column, newIdx);
   } else {
-    QModelIndex idx = mapToSource(index(row, column, parent));
-
-    return sourceModel()->dropMimeData(data, action, idx.row(), idx.column(), idx.parent());
+    if (row == -1) {
+      return sourceModel()->dropMimeData(data, action, -1, -1, mapToSource(parent));
+    } else {
+      QModelIndex idx = mapToSource(index(row, column, parent));
+      return sourceModel()->dropMimeData(data, action, idx.row(), idx.column(), idx.parent());
+    }
   }
 }
 
diff --git a/src/version.rc b/src/version.rc
index 8a299a2d..93de7128 100644
--- a/src/version.rc
+++ b/src/version.rc
@@ -1,7 +1,7 @@
 #include "Winver.h"
 
-#define VER_FILEVERSION     1,3,8,0
-#define VER_FILEVERSION_STR "1,3,8,0\0"
+#define VER_FILEVERSION     1,3,9,0
+#define VER_FILEVERSION_STR "1,3,9,0\0"
 
 VS_VERSION_INFO VERSIONINFO
 FILEVERSION     VER_FILEVERSION