Vaadin 8 - "Failed Provisional Load" error in chromium engine

Hi,

We’re using Vaadin 8 for a larger project and part of the project is an InDesign Extension. InDesign contains a full chromium engine and we’re using this to show a page generated by vaadin.
Works great for InDesign CC 2014 up to CC 2018. In CC 2019 I don’t see the content of the page. In the InDesign logfiles I see this message:

[0527/144651.129971:VERBOSE1:navigator_impl.cc(242)]
 Failed Provisional Load: http://192.168.18.72:8081/dp/portal/connector1?authorization=TXlTUUxcYWRtaW46&publication=39&issue=98&session=c5b54c52-7150-4663-90fd-502c0b49b903&connector=true#!/connector1, error_code: -3, error_description: , showing_repost_interstitial: 0, frame_id: 3

If i copy the URL and paste it to a browser it works - looks like a problem in the chromium engine in InDesign.

Any idea how I can solve this?