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 ('e20bbc3cef80db8c1b12686623e95d31', -1, 1638204947, 1638204947, '36eabfca', 38, 0, 0)

Line : 187
File : sessions.php