click backbutton hardware android to exit the application

AliAli.1023AliAli.1023 USMember
edited January 2017 in Xamarin.Forms

Here is the case

I have master page as landing page as navigation page
MainPage =new NavigationPage( new AppName.MasterPage());
on click hardware backbutton to exist the app. It gives the following error

**System.ArgumentException: Handle must be valid.

Parameter name: instance**

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