SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: SELECT t.*, v.id AS isvoted FROM bb1_threads t LEFT JOIN bb1_votes v ON (v.id=t.threadid AND v.votemode=2 AND v.ipaddress='54.81.157.56') WHERE t.threadid = '6748'
mysql error: Unknown column 'v.votemode' in 'on clause'
mysql error number: 1054
mysql version: 5.5.57-0+deb7u1-log
php version: 5.6.31
Date: 21.08.2017 @ 06:47
Script: /thread.php?threadid=6748&goto=lastpost&sid=4c7aec43879b5845584b97fa2163bb88
Referer: