when you join a table, it doesn’t select the column automatically. Thats how sql works.
SELECT
Countries.ID,
Countries.Negara
FROM Countries
INNER JOIN Users ON Users.countrie_id = Countries.ID
is not the same as
SELECT
Countries.ID,
Countries.Negara,
Users.ID,
Users.Nama
FROM Countries
INNER JOIN Users ON Users.countrie_id = Countries.ID
Are not the same.
In your code you are using the first approach.
I suggest follow this approach