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 ('ad81ef5d0226ddbd2d99e69b0a61b7e2','0','3.138.122.4','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714826147','board.php?boardid=299&page=1&daysprune=1000&sortfield=starter&sortorder=ASC&sid=61178f2de450ef121fe07dd713a8b193','0','0','')
mysql error: Duplicate entry 'ad81ef5d0226ddbd2d99e69b0a61b7e2' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 04.05.2024 @ 14:35
Script: /board.php?boardid=299&page=1&daysprune=1000&sortfield=starter&sortorder=ASC&sid=61178f2de450ef121fe07dd713a8b193
Referer: