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 ('09c6b6876dd794a06c0934f5a4c0c0eb', -1, 1714063859, 1714063859, '340f3f91', -8, 0, 0)

Line : 187
File : sessions.php