I choose some rows and columns... and when I click the "generate HTML" button: a. it makes a request to some /admin-ajax.php b. the request fails, returning a

I choose some rows and columns... and when I click the "generate HTML" button: a. it makes a request to some /admin-ajax.php b. the request fails, returning a "400 Bad request" c. the user gets no feedback at all, making it appear as if the button does nothing at all What's weird is that the actual HTML seems to be correctly generated in the client because it is sent in the request to admin-ajax.php. So, that request doesn't seem to be needed and it breaks the functionality.