Ajax calls PHP file but some datas doesn't return

"undone" OR "error" RETURNS. BUT "done" DOESN'T RETURN.
When mail adress exists 'undone' returns, inserting new user to database works but 'done' doesn't return. I wanna see "undone" from $data["status"] return when user is inserted. How can i fix?
js

file.php

View on Stack Overflow