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 ('6bea72561920ebb5a9fe4297f1e5f736', -1, 1714016184, 1714016184, '12d99020', -2, 0, 0)

Line : 187
File : sessions.php