Index: menu.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/menu.inc,v
retrieving revision 1.191
diff -u -p -r1.191 menu.inc
--- menu.inc	7 Aug 2007 08:41:24 -0000	1.191
+++ menu.inc	10 Aug 2007 21:56:26 -0000
@@ -1420,7 +1420,7 @@ function _menu_navigation_links_rebuild(
   }
   $placeholders = implode(', ', array_fill(0, count($menu), "'%s'"));
   // Remove items if their router path does not exist any more.
-  db_query('DELETE FROM {menu_links} WHERE router_path NOT IN ('. $placeholders .')', array_keys($menu));
+  db_query('DELETE FROM {menu_links} WHERE router_path NOT IN (\'\', '. $placeholders .')', array_keys($menu));
 }
 
 /**