SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error:
mysql error number:
mysql version: unknown
php version: 7.0.33-0ubuntu0.16.04.16
Date: 30.04.2024 @ 23:46
Script: /board/search.php?action=user&userid=15417&sid=3c3cc9214ded839463107f5c15b61f6e
Referer: http://www.tabletop-tirol.net/board/search.php?action=user&userid=15417&sid=3c3cc9214ded839463107f5c15b61f6e