Permission actions-on-google not showing up

Question

I'm facing a problem when asking the user to grant a permission. I don't know why but the same code I used until 4 days ago is no longer working.

app.intent('Default Welcome Intent', conv => {
conv.data.requestedPermission = 'NAME';

if(!conv.user.storage.name) {
  console.log('name non esiste');
    return conv.ask(new Permission({
        context: 'Benvenuto',
        permissions: conv.data.requestedPermission,
    }));
}
});

Here's an example, when my action starts, it just says "Demo stopped working.." (and it enters the if because I can see the log message). and I get the same result with any permission request in my code. As I said before, the same code was working some days ago. Could you help me?