ERROR: Field "category_head" or index 0 is not in result (q_FromDB)

1) /www/htdocs/w00579a2/de/unternehmen/ocs-nachricht.php(15): require('/www/htdocs/w00...')
2) /www/htdocs/w00579a2/ocs-main/q-web/q-web-page-templates/_ocs-template-blog-article.php(99): q_FromDB('string', 'category_head', Array)