SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6 pl2): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('a6fa96f9db729b98d55e3c47dd21b5c5','0','18.218.155.103','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1744856496','thread.php?postid=23121','0','0','')
mysql error: Duplicate entry 'a6fa96f9db729b98d55e3c47dd21b5c5' for key 'PRIMARY'
mysql error number: 1062
mysql version: 8.0.11
php version: 5.6.10
Date: 17.04.2025 @ 04:21
Script: /thread.php?postid=23121
Referer: http://www.gttempel.de/thread.php?goto=lastpost&threadid=1346