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 ('91c7a8a958880a0545b8c1d251e2ff57','0','18.220.1.239','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715016848','thread.php?goto=firstnew_thread&threadid=809&sid=0db8870fef782bb73c3ee591a12a5d55','0','0','')
mysql error: Duplicate entry '91c7a8a958880a0545b8c1d251e2ff57' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 06.05.2024 @ 19:34
Script: /thread.php?goto=firstnew_thread&threadid=809&sid=0db8870fef782bb73c3ee591a12a5d55
Referer: http://wehrbauten.de/thread.php?goto=firstnew_thread&threadid=809&sid=0db8870fef782bb73c3ee591a12a5d55