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 ('d87be43dd831d04667f3f7586dbcdb9d','0','18.216.213.126','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715341527','board.php?boardid=640&sid=bb1cb1b654d72819e7185797d728831a','0','0','')
mysql error: Duplicate entry 'd87be43dd831d04667f3f7586dbcdb9d' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 10.05.2024 @ 13:45
Script: /board.php?boardid=640&sid=bb1cb1b654d72819e7185797d728831a
Referer: http://wehrbauten.de/board.php?boardid=640&sid=bb1cb1b654d72819e7185797d728831a