Unable to delete model type when model type name is number

Hello,

Please try to create model type and name it with numbers.
You will get 404 for all admin pages.
After some diving its related to menu.inc (line 474) _menu_translate , where it will return false.

      drupal_alter('menu_get_item', $router_item, $path, $original_map);
      $map = _menu_translate($router_item, $original_map);
      var_dump($router_item);
      $router_item['original_map'] = $original_map;
      if ($map === FALSE) {
        $router_items[$path] = FALSE;
        return FALSE;
      }

Any one can give hand here.
Regards