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 ('f3bfaa5fa077912d2132d5d54e801977', -1, 1579976966, 1579976966, '03e3f08f', -4, 0, 0)

Line : 187
File : sessions.php