(gtk_tree_view_set_column_drag_info): Don't crash if the

	column_drop_func says always no.  (#344850, Christian Weiske)

1 files changed, 4 insertions, 3 deletions

diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index aa670a8a9f..4307f9c7d0 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -9028,9 +9028,10 @@ gtk_tree_view_set_column_drag_info (GtkTreeView       *tree_view,
 
   /* We know there are always 2 slots possbile, as you can always return column. */
   /* If that's all there is, return */
-  if (tree_view->priv->column_drag_info->next->next == NULL &&
-      ((GtkTreeViewColumnReorder *)tree_view->priv->column_drag_info->data)->right_column == column &&
-      ((GtkTreeViewColumnReorder *)tree_view->priv->column_drag_info->next->data)->left_column == column)
+  if (g_list_length (tree_view->priv->column_drag_info) < 2 || 
+      (tree_view->priv->column_drag_info->next->next == NULL &&
+       ((GtkTreeViewColumnReorder *)tree_view->priv->column_drag_info->data)->right_column == column &&
+       ((GtkTreeViewColumnReorder *)tree_view->priv->column_drag_info->next->data)->left_column == column))
     {
       for (tmp_list = tree_view->priv->column_drag_info; tmp_list; tmp_list = tmp_list->next)
 	g_free (tmp_list->data);