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 ('53b9155ade59122df9f617c2cb393634','0','18.222.37.169','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714632816','board.php?boardid=242&sid=b43a5c04ab108ef995dfc9eecdaf0538','0','0','')
mysql error: Duplicate entry '53b9155ade59122df9f617c2cb393634' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 02.05.2024 @ 08:53
Script: /board.php?boardid=242&sid=b43a5c04ab108ef995dfc9eecdaf0538
Referer: http://wehrbauten.de/board.php?boardid=242&sid=b43a5c04ab108ef995dfc9eecdaf0538