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 ('56c43fc46e3b9c25640b34a13e9e581b','0','3.21.247.253','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715892497','board.php?boardid=454&sid=21549e96d74ac9fba930ad9202b15bb9','0','0','')
mysql error: Duplicate entry '56c43fc46e3b9c25640b34a13e9e581b' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 16.05.2024 @ 22:48
Script: /board.php?boardid=454&sid=21549e96d74ac9fba930ad9202b15bb9
Referer: http://wehrbauten.de/board.php?boardid=454&sid=21549e96d74ac9fba930ad9202b15bb9