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 ('b121607b5ab9b04debf9caf5f2a45b38', -1, 1712925479, 1712925479, '2cc96100', -4, 0, 0)

Line : 187
File : sessions.php