Internal error when webpage is shown inside webviewer (MIT App Inventor Companion)

When I open the following page in Chrome on my iphone everything works fine

https://forkphorus.github.io/app.html?id=673890545

Instead, if I open the page inside a webviewer component and I open the app in MIT App Inventor 2 Companion, after a little while I get an error message saying that "An Internal error occurred".

Try https://gallery-appinventor-mit-edu.ezproxy.canberra.edu.au/?galleryid=386dd4c4-421b-43ef-b0a8-2fe24608f073 in MIT Companion.

It loads fine for me (on Android). Are you testing the app on the iOS companion, too?

Yes, the link works fine in iOS. But if I open it inside the webvewer component it crashes.

Try https://gallery-appinventor-mit-edu.ezproxy.canberra.edu.au/?galleryid=386dd4c4-421b-43ef-b0a8-2fe24608f073 in MIT Companion.

Is the companion you are testing it on is on the iPhone? I apologize for the lack of clarity.

Yes, on the iphone