phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO darkdoor_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, is_robot) VALUES ('ba574480c5e2197e04e17d7e3c7711a2', -1, 1568673981, 1568673981, '23ad2f2b', 11, 0, '0', '0')

Line : 175
File : sessions.php