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

1) /usr/www/users/seefel/seefeld-wordpress/aktuelles/aktuelles-cat.php(15): require('/usr/www/users/...')
2) /usr/www/users/seefel/seefeld-wordpress/gsf-main/q-web/q-web-page-templates/_gsf-template-blog-cat.php(30): q_FromDB('string', 'tag', Array)