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 ('a1b0de45b11eda80de86f23a4ad1fc4f','0','18.188.216.249','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1717353865','markread.php?boardid=22&sid=a8be5cfb98d5ce8f7040528ce1f04549','0','0','')
mysql error: Duplicate entry 'a1b0de45b11eda80de86f23a4ad1fc4f' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 02.06.2024 @ 20:44
Script: /markread.php?boardid=22&sid=a8be5cfb98d5ce8f7040528ce1f04549
Referer: