diff -u b/includes/menu.inc b/includes/menu.inc
--- b/includes/menu.inc
+++ b/includes/menu.inc
@@ -462,9 +462,12 @@
     }
     $original_map = arg(NULL, $path);
 
-    // Since there is no limit to the length of $path, use a hash to keep it
-    // short yet unique.
-    $cid = variable_get('use_menu_router_cache_for_lru_backend', FALSE) ? 'menu_item:' . hash('sha256', $path) : FALSE;
+    $cid = FALSE;
+    if (variable_get('use_menu_router_cache_for_lru_backend', FALSE)) {
+      // Since there is no limit to the length of $path, use a hash to keep it
+      // short yet unique.
+      $cid = 'menu_item:' . hash('sha256', $path);
+    }
     if ($cid && $cached = cache_get($cid, 'cache_menu')) {
       $router_item = $cached->data;
     }