SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6 pl2): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('9878c054b1ecde5f817a9a3f1d261c85','0','18.116.85.58','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715895777','thread.php?threadid=72&threadview=1&hilight=&hilightuser=0','0','0','')
mysql error: Duplicate entry '9878c054b1ecde5f817a9a3f1d261c85' for key 'PRIMARY'
mysql error number: 1062
mysql version: 8.0.11
php version: 5.6.10
Date: 16.05.2024 @ 23:42
Script: /thread.php?threadid=72&threadview=1&hilight=&hilightuser=0
Referer: http://www.gttempel.at/thread.php?threadid=72&threadview=1&hilight=&hilightuser=0