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 ('ad60b5772213f03b8ab8405d59311002', -1, 1714005728, 1714005728, '2cc961e0', -4, 0, 0)

Line : 187
File : sessions.php