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Androd Webbrowser Widget not working

I succesfully built and packaged my game for distribution. But the webbrowser widget does not work. The app closes or crashes when I open the webbrowser I am submitting my app as an entry in a competeion and Ihave strugled with this for about 3 weeks now. The closing date for submission for my app is coming wednesday.
Has anyone experienced this and how it can be solved? I am using ue4 verson 4.19.1