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 ('e6408f8c3c3df80998321b34d7f23c1f','0','3.133.109.211','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715570697','board.php?boardid=89&page=1&daysprune=1000&sortfield=starter&sortorder=ASC&sid=536a444b078184ccccd3cb76f11753b9','0','0','')
mysql error: Duplicate entry 'e6408f8c3c3df80998321b34d7f23c1f' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 13.05.2024 @ 05:24
Script: /board.php?boardid=89&page=1&daysprune=1000&sortfield=starter&sortorder=ASC&sid=536a444b078184ccccd3cb76f11753b9
Referer: http://wehrbauten.de/board.php?boardid=89&page=1&daysprune=1000&sortfield=starter&sortorder=ASC&sid=536a444b078184ccccd3cb76f11753b9