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 @ 18:34
Script: /wbb2/search.php?searchid=219633&sid=880cabb3c5384419eaf4258d714a8ed7
Referer: https://haumis-wbb-hilfe.de/wbb2/search.php?action=user&userid=98&sid=7526dbbec1cf3d9d75c978c61f83d33f