Shopify Billing API tutorial does not work - Unhandled Runtime Error

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I have implemented the billing API tutorial, but after making test subscription to my demo app, I am receiving an error popup, which quickly closes:

Unhandled Runtime Error

TypeError: undefined is not an object (evaluating 'pages.includes')

Call Stack
[native code]


In the browser console, I find this:


Unable to post message to Recipient has origin https://localhost:3000

Unhandled Promise Rejection: TypeError: undefined is not an object (evaluating 'pages.includes')


The email, though, is being sent to my mailbox. 


I assume that our customers should not see this error, which is probably something that need fixing.