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 ('3545e96db781202e25822b0be40ee9ea','0','3.141.164.243','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715550146','calendar.php?sid=7f24c0a4bf69ad2da8aa2aed15db4eeb','0','0','')
mysql error: Duplicate entry '3545e96db781202e25822b0be40ee9ea' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 12.05.2024 @ 23:42
Script: /calendar.php?sid=7f24c0a4bf69ad2da8aa2aed15db4eeb
Referer: http://wehrbauten.de/calendar.php?sid=7f24c0a4bf69ad2da8aa2aed15db4eeb