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 ('63aa5e2e9f7fff6b6b1c8688d08b89f5', -1, 1714011794, 1714011794, '12e3727d', -7, 0, 0)

Line : 187
File : sessions.php