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 ('a9dfb7d6a0a6c49272d8a542b1d703ec','0','3.149.254.35','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714673351','board.php?boardid=481&sid=24e54a2ed301bff51abe8f80bdd0c856','0','0','')
mysql error: Duplicate entry 'a9dfb7d6a0a6c49272d8a542b1d703ec' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 02.05.2024 @ 20:09
Script: /board.php?boardid=481&sid=24e54a2ed301bff51abe8f80bdd0c856
Referer: http://wehrbauten.de/board.php?boardid=481&sid=24e54a2ed301bff51abe8f80bdd0c856