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 ('51c6e96520b2f7c33dff927cd6c2d1d7','0','52.15.59.163','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714535717','board.php?boardid=272&sid=6415a9d943bd923e7c45a054416afb37','0','0','')
mysql error: Duplicate entry '51c6e96520b2f7c33dff927cd6c2d1d7' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 01.05.2024 @ 05:55
Script: /board.php?boardid=272&sid=6415a9d943bd923e7c45a054416afb37
Referer: