--- gdm-2.23.92/gui/simple-greeter/gdm-option-widget.c	2008-08-26 15:03:59.000000000 -0400
+++ foo/gui/simple-greeter/gdm-option-widget.c	2008-09-19 09:57:30.000000000 -0400
@@ -148,7 +148,8 @@
         model = GTK_TREE_MODEL (widget->priv->list_store);
         item_id = NULL;
 
-        if (widget->priv->active_row == NULL) {
+        if (widget->priv->active_row == NULL ||
+            !gtk_tree_row_reference_valid (widget->priv->active_row)) {
                 return NULL;
         }