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 ('a9f9f02399fc643b6ea39ce424d9a0c1','0','3.137.220.120','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714676998','board.php?boardid=740&sid=a86401347616e05c356ba10d0a751aa3','0','0','')
mysql error: Duplicate entry 'a9f9f02399fc643b6ea39ce424d9a0c1' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 02.05.2024 @ 21:09
Script: /board.php?boardid=740&sid=a86401347616e05c356ba10d0a751aa3
Referer: