--- gail-old/gail/gailtreeview.c	2006-08-07 23:58:40.000000000 +1000
+++ gail-new/gail/gailtreeview.c	2006-08-07 23:59:30.000000000 +1000
@@ -923,7 +923,9 @@
 
   /* If there are more than one renderer in the list, make a container */
 
-  g_assert (renderer_list != NULL);
+  if (renderer_list == NULL)
+    return NULL;
+
   if (renderer_list->next)
     {
       GailCell *container_cell;
