SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('4b646a7bb0da1e41eb64240b6a47c85e','0','18.191.239.123','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714596122','board.php?boardid=88&sid=796cfd3e46348d5af01c696a6e39b0ab','0','0','')
mysql error: Duplicate entry '4b646a7bb0da1e41eb64240b6a47c85e' for key 'PRIMARY'
mysql error number: 1062
mysql version: 10.5.23-MariaDB-0+deb11u1
php version: 5.6.40
Date: 01.05.2024 @ 22:42
Script: /board.php?boardid=88&sid=796cfd3e46348d5af01c696a6e39b0ab
Referer: http://mainboard.ppg-clan.de/board.php?boardid=88&sid=796cfd3e46348d5af01c696a6e39b0ab