function _menutrails_recurse_crumbs error

nodetrail-6.x-1.x-dev. reports error about undefined function _menutrails_recurse_crumbs in nodetrail.module.
I'v took it from menu_trail module, paste it and error is gone :) :

function _menutrails_recurse_crumbs($tree, $item, &$crumbs, $above = array()) {
  foreach ($tree as $menu_item) {
    if ($menu_item['link']['link_path'] == $item['href']) {
      foreach($above as $trail_item) {
        $crumbs[] = l($trail_item['link']['link_title'], $trail_item['link']['link_path']);
      }
      $crumbs[] = l($menu_item['link']['link_title'], $menu_item['link']['link_path']);
      break;
    }
    if (is_array($menu_item['below'])) {
      $above[] = $menu_item;
      _menutrails_recurse_crumbs($menu_item['below'], $item, $crumbs, $above);
    }
  }
}

In string 26 bootstrap reports about missing argument. Was:

$options = menu_parent_options(menu_get_menus());

I'v wrote:

$options = menu_parent_options(menu_get_menus(),'');

I don't know, is it solution correct, but for me it seems to work fine...