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 ('64c1b6023528e80041f94a440273847e','0','18.221.99.121','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1745220691','thread.php?goto=lastpost&threadid=953','0','0','')
mysql error: Duplicate entry '64c1b6023528e80041f94a440273847e' for key 'PRIMARY'
mysql error number: 1062
mysql version: 8.0.11
php version: 5.6.10
Date: 21.04.2025 @ 09:31
Script: /thread.php?goto=lastpost&threadid=953
Referer: http://www.gttempel.de/thread.php?goto=firstnew_thread&threadid=953