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 ('1a26a1d5ecb35ff915bfa57df6843782','0','3.149.229.253','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714146707','klassentreffen-a.php?sid=bc964fc188c71a170dda14da3c687bf3','0','0','')
mysql error: Duplicate entry '1a26a1d5ecb35ff915bfa57df6843782' for key 'PRIMARY'
mysql error number: 1062
mysql version: 10.5.19-MariaDB-0+deb11u2
php version: 5.6.40
Date: 26.04.2024 @ 17:51
Script: /schule/klassentreffen-a.php?sid=bc964fc188c71a170dda14da3c687bf3
Referer: