private function updateChildren(array $ids)
    {
        if (count($ids) < 1) {
            return;
        }

        foreach ($ids as $id) {
            $alias = $this->db->fetchColumn('SELECT alias FROM tl_page WHERE id=?', [$id]);
            $alias = $this->cleanAlias($alias);

            $this->db->update('tl_page', ['alias' => $alias], ['id' => $id]);
        }
    }