diff --git a/modules/menu/menu.admin.inc b/modules/menu/menu.admin.inc
index de74d8cf7a97242c2a4e6a76957068b682dc16ba..ec073e5b803ec96cfbb6ea75479c45773ca102a0 100644
--- a/modules/menu/menu.admin.inc
+++ b/modules/menu/menu.admin.inc
@@ -678,7 +678,7 @@ function menu_configure() {
     '#empty_option' => t('No Secondary links'),
     '#options' => $menu_options,
     '#tree' => FALSE,
-    '#description' => t('Select the source for the Secondary links. An advanced option allows you to use the same source for both Main links (currently %main) and Secondary links: if your source menu has two levels of hierarchy, the top level menu links will appear in the Main links, and the children of the active link will appear in the Secondary links.', array('%main' => $menu_options[$main])),
+    '#description' => t('Select the source for the Secondary links. An advanced option allows you to use the same source for both Main links (currently %main) and Secondary links: if your source menu has two levels of hierarchy, the top level menu links will appear in the Main links, and the children of the active link will appear in the Secondary links.', array('%main' => $main ? $menu_options[$main] : 'none')),
   );
 
   return system_settings_form($form);