phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b21474583df74eb8a3ec6a89f8bff9bb' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b21474583df74eb8a3ec6a89f8bff9bb', -1, 1769465079, 1769465079, 'd849d814', -4, 0, 0)

Line : 187
File : sessions.php