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 ('a18436621b8d9af42619477dbb924ddc','0','3.12.71.237','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715128547','board.php?boardid=362&sid=51e3355befe2e7e42f4ba6372bd7375d','0','0','')
mysql error: Duplicate entry 'a18436621b8d9af42619477dbb924ddc' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 08.05.2024 @ 02:35
Script: /board.php?boardid=362&sid=51e3355befe2e7e42f4ba6372bd7375d
Referer: http://wehrbauten.de/board.php?boardid=362&sid=51e3355befe2e7e42f4ba6372bd7375d