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 ('b9f2535b1a07c86edc43baa84e75735e','0','3.144.31.39','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715580010','thread.php?goto=lastpost&threadid=527&sid=937906730d63dc2833dfce5c9f2a3e36','0','0','')
mysql error: Duplicate entry 'b9f2535b1a07c86edc43baa84e75735e' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 13.05.2024 @ 08:00
Script: /thread.php?goto=lastpost&threadid=527&sid=937906730d63dc2833dfce5c9f2a3e36
Referer: http://wehrbauten.de/thread.php?goto=lastpost&threadid=527&sid=937906730d63dc2833dfce5c9f2a3e36