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 ('9c497c25024dc6b8534ef5bc56251473','0','18.221.154.151','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715353857','register.php?sid=990e6c175710fa9aafd617332daa3e01','0','0','')
mysql error: Duplicate entry '9c497c25024dc6b8534ef5bc56251473' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 10.05.2024 @ 17:10
Script: /register.php?sid=990e6c175710fa9aafd617332daa3e01
Referer: http://wehrbauten.de/register.php?sid=990e6c175710fa9aafd617332daa3e01