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 ('af86f76ce0723124cbc5e08c4f4e23df','0','18.189.180.76','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714899088','thread.php?goto=nextoldest&threadid=1581&sid=a89fd0a9068e574f5e1138e03fb818c4','0','0','')
mysql error: Duplicate entry 'af86f76ce0723124cbc5e08c4f4e23df' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 05.05.2024 @ 10:51
Script: /thread.php?goto=nextoldest&threadid=1581&sid=a89fd0a9068e574f5e1138e03fb818c4
Referer: