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 ('9fa04e417bf913c20836bc0ab4b300d6', -1, 1561528663, 1561528663, '36dd91ae', 30, 0, 0)

Line : 191
File : sessions.php