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 ('26bf9a374abbd69b006b55f07463340e','0','18.223.172.252','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715052058','board.php?boardid=250&sid=b989037af0b527ff88cecab2e75ec55d','0','0','')
mysql error: Duplicate entry '26bf9a374abbd69b006b55f07463340e' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 07.05.2024 @ 05:20
Script: /board.php?boardid=250&sid=b989037af0b527ff88cecab2e75ec55d
Referer: http://wehrbauten.de/board.php?boardid=250&sid=b989037af0b527ff88cecab2e75ec55d