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='54.167.29.208') WHERE t.threadid = '6748'
mysql error: Unknown column 'v.votemode' in 'on clause'
mysql error number: 1054
mysql version: 5.5.59-0+deb7u1-log
php version: 5.6.33
Date: 25.02.2018 @ 14:21
Script: /thread.php?postid=33516&sid=a111f42771c2a375f86f55b14eedf6c3
Referer: