diff --git a/modules/system/system.install b/modules/system/system.install
index 676d272..e6a2500 100644
--- a/modules/system/system.install
+++ b/modules/system/system.install
@@ -3025,7 +3025,7 @@ function system_update_7074() {
     ->execute()->fetchCol();
   foreach ($mlids as $mlid) {
     $menu_link = menu_link_load($mlid);
-    if (is_string($menu_link['options']['query'])) {
+    if (isset($menu_link['options']['query']) && is_string($menu_link['options']['query'])) {
       $menu_link['options']['query'] = drupal_get_query_array($menu_link['options']['query']);
       menu_link_save($menu_link);
     }