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 ('a9c2391ba978cb6d0c5a888e34159777','0','13.59.61.119','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715076015','thread.php?threadid=2039&threadview=1&hilight=&hilightuser=0&sid=b6fa8136c0bf3bdc2b307cb50979937c','0','0','')
mysql error: Duplicate entry 'a9c2391ba978cb6d0c5a888e34159777' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 07.05.2024 @ 12:00
Script: /thread.php?threadid=2039&threadview=1&hilight=&hilightuser=0&sid=b6fa8136c0bf3bdc2b307cb50979937c
Referer: http://wehrbauten.de/thread.php?threadid=2039&threadview=1&hilight=&hilightuser=0&sid=b6fa8136c0bf3bdc2b307cb50979937c