How to close the window?

Question

Java

Hello! I am writing an application, I have reached the stage of checking whether GPS is enabled or not, if it is enabled, I go further according to the logic of the program, if not, I display a dialog and transfer the user to the location settings.
Dialog code:

final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("GPS выключен, включить?")
                .setCancelable(false)
                .setPositiveButton("Да", new DialogInterface.OnClickListener() {
                    public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
                        dialog.cancel();
                        startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
                        checkGpsStatus();
                    }
                })
                .setNegativeButton("Нет", new DialogInterface.OnClickListener() {
                    public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
                        checkGpsStatus();
                    }
                });
        final AlertDialog alert = builder.create();
        alert.show();

The problem is that the dialog appears when I click on "YES" - it takes me to the location settings, there I turn on gps, then I press the "back" button and it throws me back to my program, but the dialog is not closed but open , when you click on "no" - the program crashes, when you click on "yes" the settings open again, when you click "back" the program crashes. What's wrong? How to win it?