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 ('21b246baa7ddcc0984d3e39b52737a0e','0','3.142.174.55','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714773392','board.php?boardid=527&sid=a2b840f836ac9b35bd4b5f0238ee29c2','0','0','')
mysql error: Duplicate entry '21b246baa7ddcc0984d3e39b52737a0e' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 03.05.2024 @ 23:56
Script: /board.php?boardid=527&sid=a2b840f836ac9b35bd4b5f0238ee29c2
Referer: