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 ('77d5a35148e101c50bac5d7f673a8925', -1, 1582889544, 1582889544, '03e9d95b', 21, 0, 0)

Line : 191
File : sessions.php