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 ('6e975d5c9d5ad2a1384bd0d4e3c1a931', -1, 1713864640, 1713864640, '340e0822', -8, 0, 0)

Line : 187
File : sessions.php