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 ('b9905e3c9a62d199bc1cac0b0b1b4bb1','0','3.19.31.73','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715344667','thread.php?goto=lastpost&threadid=1503&sid=9d1e0cfc0760b5a223d4c9df7aa628ca','0','0','')
mysql error: Duplicate entry 'b9905e3c9a62d199bc1cac0b0b1b4bb1' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 10.05.2024 @ 14:37
Script: /thread.php?goto=lastpost&threadid=1503&sid=9d1e0cfc0760b5a223d4c9df7aa628ca
Referer: http://wehrbauten.de/thread.php?goto=lastpost&threadid=1503&sid=9d1e0cfc0760b5a223d4c9df7aa628ca