diff --git includes/menu.inc includes/menu.inc
index c4b3c10..56d6212 100644
--- includes/menu.inc
+++ includes/menu.inc
@@ -770,7 +770,7 @@ function _menu_translate(&$router_item, $map, $to_arg = FALSE) {
     $tab_parent_map = explode('/', $router_item['tab_parent']);
   }
   for ($i = 0; $i < $router_item['number_parts']; $i++) {
-    if ($link_map[$i] == '%') {
+    if ($link_map[$i] == '%' && isset($path_map[$i])) {
       $link_map[$i] = $path_map[$i];
     }
     if (isset($tab_root_map[$i]) && $tab_root_map[$i] == '%') {