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 ('431a16f5bce6fbb110fcf29ce7519ce5','0','18.116.238.69','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1717324022','calendar.php?sid=c8757b6879f7e1c45b01eef1d9cee43a','0','0','')
mysql error: Duplicate entry '431a16f5bce6fbb110fcf29ce7519ce5' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 02.06.2024 @ 12:27
Script: /calendar.php?sid=c8757b6879f7e1c45b01eef1d9cee43a
Referer: