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 ('f22dd0438ea29b9a3192b1029ef7622e', -1, 1568672014, 1568672014, '23ad2f2b', 1, 0, '0', '0')

Line : 175
File : sessions.php