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 ('21bf34f84c0d55de8103a7c512d56ef1','0','18.119.143.4','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715175519','board.php?boardid=743&sid=dada3837fa238ad6f3da6df4656b9959','0','0','')
mysql error: Duplicate entry '21bf34f84c0d55de8103a7c512d56ef1' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 08.05.2024 @ 15:38
Script: /board.php?boardid=743&sid=dada3837fa238ad6f3da6df4656b9959
Referer: