WebView in QML crashes when clicking on youtube link in embedded player

I tried our application with the latest Qt version (5.15.0) and everything seemed to work, but after I clicked on the youtube logo in our tutorial videos, the application crashed.

I reproduced the crash with the qml WebView example from the Qt installation:

Examples\Qt-5.15.0\webview\minibrowser

This can be reproduced on Windows, Linux and Mac, by visiting the url:

https://www.youtube.com/embed/dstqPqg7gbY?modestbranding=1&fs=0&rel=0&hd=1&disablekb=0&showinfo=0&iv_load_policy=0&enablejsapi=1&autoplay=0&loop=0&controls=0

and clicking on the youtube logo in the bottom right corner or on the top left text.

I got a stacktrace from QtCreator, see attachment, I hope that helps to fix it.

Before that we used Qt 5.10.1 and nothing happend when I clicked on the youtube logo, which is not ideal, but better than crashing the whole application.