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 ('520a972504eacc19283e738b9597cfb3','0','3.141.199.243','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714938519','board.php?boardid=240&sid=9691b8c708e672d533573d2856379c03','0','0','')
mysql error: Duplicate entry '520a972504eacc19283e738b9597cfb3' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 05.05.2024 @ 21:48
Script: /board.php?boardid=240&sid=9691b8c708e672d533573d2856379c03
Referer: http://wehrbauten.de/board.php?boardid=240&sid=9691b8c708e672d533573d2856379c03