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 ('b4b9dcd4688c44fbbe84e0f9f8fcb439','0','18.225.56.251','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715883601','search.php?sid=ab296ce3ef5514b46632bbfa2393fd2c','0','0','')
mysql error: Duplicate entry 'b4b9dcd4688c44fbbe84e0f9f8fcb439' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 16.05.2024 @ 20:20
Script: /search.php?sid=ab296ce3ef5514b46632bbfa2393fd2c
Referer: http://wehrbauten.de/search.php?sid=ab296ce3ef5514b46632bbfa2393fd2c