phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO filmscd_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, is_robot) VALUES ('b7712cd82cecde77cbff730b6429869c', -1, 1711631217, 1711631217, '2cc8d22b', -10, 0, '0', '0')

Line : 175
File : sessions.php