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 ('3d21d95eceeb5a6921e50563183c0339', -1, 1571324695, 1571324695, '22ecd85d', 26, 0, 0)

Line : 191
File : sessions.php