diff --git a/src/mac/carbon/dnd.cpp b/src/mac/carbon/dnd.cpp
index 6e9d76af94..bee0d543ee 100644
--- a/src/mac/carbon/dnd.cpp
+++ b/src/mac/carbon/dnd.cpp
@@ -86,7 +86,9 @@ wxDragResult wxDropTarget::OnData(
 bool wxDropTarget::CurrentDragHasSupportedFormat()
 {
     bool supported = false;
-
+    if (m_dataObject == NULL)
+        return false;
+        
     if ( gTrackingGlobals.m_currentSource != NULL )
     {
         wxDataObject* data = gTrackingGlobals.m_currentSource->GetDataObject();