public function addBrokenIndicatorOnPostSerialize(ObjectEvent $event)
    {
        $article = $event->getObject();
        $visitor = $event->getVisitor();

        if (!($article instanceof ArticleViewDocumentInterface)) {
            return;
        }

        $structure = $this->structureManager->getStructure($article->getStructureType(), 'article');
        $visitor->addData('broken', !$structure || $structure->getKey() !== $article->getStructureType());
        $visitor->addData('originalStructureType', $article->getStructureType());
    }