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 ('7b8a9cc4fdd6f6ef09f07548637c8f3b', -1, 1579339501, 1579339501, '12cff023', 3, 0, 0)

Line : 187
File : sessions.php