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='107.22.15.235') WHERE t.threadid = '2001'
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: 27.04.2017 @ 03:14
Script: /thread.php?threadid=2001&goto=lastpost&sid=9fa75288e34d19b1895e59d4cb86ef4c
Referer: