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 ('8df311127591bebb305078fc81301e8d','0','18.222.131.58','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715674321','board.php?boardid=257&sid=152adb9b2c46eaea8f858ad82c04e0e5','0','0','')
mysql error: Duplicate entry '8df311127591bebb305078fc81301e8d' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 14.05.2024 @ 10:12
Script: /wbb2/board.php?boardid=257&sid=152adb9b2c46eaea8f858ad82c04e0e5
Referer: