#
#
# patch "src/model/Toposort.cpp"
#  from [0100c237385ea177420b36a3daa5d7642ea49f89]
#    to [d081059ec2bc33341fc9b6fc75292072cb29a3fe]
#
============================================================
--- src/model/Toposort.cpp	0100c237385ea177420b36a3daa5d7642ea49f89
+++ src/model/Toposort.cpp	d081059ec2bc33341fc9b6fc75292072cb29a3fe
@@ -40,10 +40,13 @@ void Toposort::setSourceModel(QAbstractI
 
 void Toposort::setSourceModel(QAbstractItemModel * source)
 {
-    disconnect(
-        sourceModel(), SIGNAL(modelReset()),
-        this, SLOT(sortModel())
-    );
+    if (sourceModel() != 0)
+    {
+        disconnect(
+            sourceModel(), SIGNAL(modelReset()),
+            this, SLOT(sortModel())
+        );
+    }
 
     QSortFilterProxyModel::setSourceModel(source);