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 ('c9535c12a3e62a87bf4a35584c38cb2d','0','3.15.237.255','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715209646','markread.php?boardid=192&sid=a890ca57e6f644b004e22fef619583ad','0','0','')
mysql error: Duplicate entry 'c9535c12a3e62a87bf4a35584c38cb2d' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 09.05.2024 @ 01:07
Script: /markread.php?boardid=192&sid=a890ca57e6f644b004e22fef619583ad
Referer: