private function getNodeTranslationMap()
    {
        if (is_null($this->nodeTranslationMap)) {
            $sql = 'SELECT id, url, lang FROM kuma_node_translations';
            $stmt = $this->em->getConnection()->prepare($sql);
            $stmt->execute();
            $this->nodeTranslationMap = $stmt->fetchAll();
        }

        return $this->nodeTranslationMap;
    }