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 ('64493d544e2a6159faf58d5e47eab882','0','3.21.76.0','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715024404','board.php?boardid=232&sid=9c519a0a6b72cda96d9e008f7a206663','0','0','')
mysql error: Duplicate entry '64493d544e2a6159faf58d5e47eab882' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 06.05.2024 @ 21:40
Script: /board.php?boardid=232&sid=9c519a0a6b72cda96d9e008f7a206663
Referer: http://wehrbauten.de/board.php?boardid=232&sid=9c519a0a6b72cda96d9e008f7a206663