SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('81f204a430df64f561e7f2154dc73757','0','3.136.18.61','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1716339272','thread.php?goto=lastpost&threadid=8111&sid=28368132c3c2bb345c579c75e2bfe787','0','0','')
mysql error: Duplicate entry '81f204a430df64f561e7f2154dc73757' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 22.05.2024 @ 02:54
Script: /thread.php?goto=lastpost&threadid=8111&sid=28368132c3c2bb345c579c75e2bfe787
Referer: