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 ('b15da51f1d0ad10d193a7c99706be365','0','18.216.34.146','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714545783','register.php?sid=6bfafe8c78f0134839af839f169d38df','0','0','')
mysql error: Duplicate entry 'b15da51f1d0ad10d193a7c99706be365' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 01.05.2024 @ 08:43
Script: /register.php?sid=6bfafe8c78f0134839af839f169d38df
Referer: