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 ('4f405c4931ebf831478ff4e31ecdd7f2','0','3.147.103.227','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715452490','register.php?sid=6958545c4aa2b7f8cb70eba041286544','0','0','')
mysql error: Duplicate entry '4f405c4931ebf831478ff4e31ecdd7f2' for key 'PRIMARY'
mysql error number: 1062
mysql version: 10.6.15-MariaDB-cll-lve-log
php version: 5.6.40
Date: 11.05.2024 @ 18:34
Script: /register.php?sid=6958545c4aa2b7f8cb70eba041286544
Referer: http://www.biker-community.com/register.php?sid=6958545c4aa2b7f8cb70eba041286544