phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('55e28061d55f0639b7b47121d7b51167', -1, 1728965689, 1728965689, '23ad3012', -1, 0, 0)

Line : 172
File : sessions.php