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 ('b81ab8b6c63022ac03ecb21519a08e14','0','18.220.140.5','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714961591','board.php?boardid=136&sid=31dabfdad42c246ea2a21f14bef7433d','0','0','')
mysql error: Duplicate entry 'b81ab8b6c63022ac03ecb21519a08e14' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 06.05.2024 @ 04:13
Script: /board.php?boardid=136&sid=31dabfdad42c246ea2a21f14bef7433d
Referer: