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 ('cdcd55f8ef585f4a8950e408cf72c9ce','0','3.23.101.91','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715945563','register.php?sid=557cd14b7b6290ec5c9bbd90063da16e','0','0','')
mysql error: Duplicate entry 'cdcd55f8ef585f4a8950e408cf72c9ce' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 4.4.9
Date: 17.05.2024 @ 13:32
Script: /board/register.php?sid=557cd14b7b6290ec5c9bbd90063da16e
Referer: