phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('7ccf2f12e54d932a4f17e9177d03f417', -1, 1596549372, 1596549372, '03ec9f82', 2, 0, 0)

Line : 187
File : sessions.php