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='54.81.216.152') WHERE t.threadid = '6841'
mysql error: Unknown column 'v.votemode' in 'on clause'
mysql error number: 1054
mysql version: 5.1.73-log
php version: 5.6.30
Date: 28.04.2017 @ 08:24
Script: /thread.php?goto=lastpost&threadid=6841&sid=eab1b5f7d2d49aa1850dc2c965290af3
Referer: