SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error:
mysql error number:
mysql version: unknown
php version: 7.2.34-nmm9
Date: 22.05.2024 @ 13:01
Script: /wbb2/search.php?searchid=218537&sid=3330477eaf8f3b6a1c0d86cc276c70b5
Referer: https://haumis-wbb-hilfe.de/wbb2/search.php?action=user&userid=504&sid=93f873686bfe682d991c9a1cac8ad044