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 ('387b07c1c7f0037c00a5933e077bdf7f', -1, 1571045464, 1571045464, '22efa071', 33, 0, 0)

Line : 191
File : sessions.php