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 ('2c1f0811fc038296b93abeed91f639af','0','3.144.238.20','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714812289','register.php?sid=86fd8a1c1ccd27148625bd2532328ff9','0','0','')
mysql error: Duplicate entry '2c1f0811fc038296b93abeed91f639af' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 04.05.2024 @ 10:44
Script: /register.php?sid=86fd8a1c1ccd27148625bd2532328ff9
Referer: http://wehrbauten.de/register.php?sid=86fd8a1c1ccd27148625bd2532328ff9