Fix crash when dragging something from another task over the editor window.

[ardour.git] / libs / gtkmm2ext / gtkmm2ext / dndtreeview.h

diff --git a/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h b/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h
index 629537767250634083a931773d33b13a650e6e48..b5f18fa8902c7545d05c057898a07821dcf105e6 100644 (file)
--- a/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h
+++ b/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h
@@ -70,6 +70,8 @@ class DnDTreeViewBase : public Gtk::TreeView
        std::string                 object_type;
 
        struct DragData {
+           DragData () : source (0) {}
+               
            Gtk::TreeView* source;
            int            data_column;
            std::string    object_type;
@@ -134,11 +136,16 @@ class DnDTreeView : public DnDTreeViewBase
        }
 
        /**
-        * this can be called by the Treeview itself or by some other
+        * This can be called by the Treeview itself or by some other
         * object that wants to get the list of dragged items.
         */
 
        void get_object_drag_data (std::list<DataType>& l, Gtk::TreeView** source) {
+
+               if (drag_data.source == 0) {
+                       return;
+               }
+                       
                Glib::RefPtr<Gtk::TreeModel> model = drag_data.source->get_model();
                DataType v;
                Gtk::TreeSelection::ListHandle_Path selection = drag_data.source->get_selection()->get_selected_rows ();