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 ('dbdfb6560028979ae8657f28acdcbb7c', -1, 1579973594, 1579973594, '03e3f08f', -4, 0, 0)

Line : 187
File : sessions.php