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 ('51bdccf1e42cdeb10fcb178ef293fb3f','0','18.227.228.95','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715179109','thread.php?goto=lastpost&threadid=1454&sid=99ebab9c274cdb9ca501dd3d39eacc06','0','0','')
mysql error: Duplicate entry '51bdccf1e42cdeb10fcb178ef293fb3f' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 08.05.2024 @ 16:38
Script: /thread.php?goto=lastpost&threadid=1454&sid=99ebab9c274cdb9ca501dd3d39eacc06
Referer: http://wehrbauten.de/thread.php?goto=lastpost&threadid=1454&sid=99ebab9c274cdb9ca501dd3d39eacc06