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 ('d4a50603ddf30fc7f231bc274c9a6971','0','3.12.108.236','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715367339','markread.php?boardid=363&sid=dd621f35117cf83232669e0c8918ce9c','0','0','')
mysql error: Duplicate entry 'd4a50603ddf30fc7f231bc274c9a6971' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 10.05.2024 @ 20:55
Script: /markread.php?boardid=363&sid=dd621f35117cf83232669e0c8918ce9c
Referer: http://wehrbauten.de/markread.php?boardid=363&sid=dd621f35117cf83232669e0c8918ce9c