SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Invalid SQL: SELECT u.userid, u.username, u.invisible, u.receivepm, u.lastactivity, uf.* FROM bb3_users u, bb3_groups g LEFT JOIN bb3_userfields uf ON (u.userid=uf.userid) WHERE u.groupid = g.groupid AND g.ismod=1 ORDER BY u.username ASC
mysql error: Unknown column 'u.userid' in 'on clause'
mysql error number: 1054
Date: 09.12.2021 @ 01:53
Script: /wbboard/team.php?sid=d7a8539a1a9492a6689e1174b67a518a
Referer: