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 ('acb8a1310ed1c5c64ad2146f495c91d9','0','18.226.98.166','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715898653','board.php?boardid=396&page=1&daysprune=1000&sortfield=replycount&sortorder=ASC&sid=dfb08b335d7750ff8a1c1e834033b96c','0','0','')
mysql error: Duplicate entry 'acb8a1310ed1c5c64ad2146f495c91d9' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 17.05.2024 @ 00:30
Script: /board.php?boardid=396&page=1&daysprune=1000&sortfield=replycount&sortorder=ASC&sid=dfb08b335d7750ff8a1c1e834033b96c
Referer: http://wehrbauten.de/board.php?boardid=396&page=1&daysprune=1000&sortfield=replycount&sortorder=ASC&sid=dfb08b335d7750ff8a1c1e834033b96c