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='54.156.82.247') WHERE t.threadid = '6840'
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: 18.11.2017 @ 13:09
Script: /thread.php?goto=lastpost&threadid=6840&sid=eab1b5f7d2d49aa1850dc2c965290af3
Referer: