diff --git a/src/kernel/qdnd_x11.cpp b/src/kernel/qdnd_x11.cpp
index 7179cc1f..42892ca0 100644
--- a/src/kernel/qdnd_x11.cpp
+++ b/src/kernel/qdnd_x11.cpp
@@ -1214,7 +1214,7 @@ Window findRealWindow( const TQPoint & pos, Window w, int md )
 
 void TQDragManager::move( const TQPoint & globalPos )
 {
-    if (!object) {
+    if (!object || !object->source()) {
         // perhaps the target crashed?
         return;
     }