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='23.20.132.227') WHERE t.threadid = '5955'
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: 25.06.2017 @ 09:05
Script: /thread.php?threadid=5955&page=1&sid=85ef9683fe38a19d813924d6333d8041
Referer: