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 ('3f2f20724a4369df6c1c2dec6d72df32','0','3.18.220.243','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715151497','board.php?boardid=509&sid=a9d83a214b255d51f6a0c640333702cf','0','0','')
mysql error: Duplicate entry '3f2f20724a4369df6c1c2dec6d72df32' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 08.05.2024 @ 08:58
Script: /board.php?boardid=509&sid=a9d83a214b255d51f6a0c640333702cf
Referer: http://wehrbauten.de/board.php?boardid=509&sid=a9d83a214b255d51f6a0c640333702cf