Fix Microsoft.AppCenter.Crashes.TestCrashException in MainPage.OnKillMeButtonClicked (System.Object sender, System.EventArgs e)

### Version 1.0(30) ###


### Stacktrace ###


### Reason ###


Microsoft.AppCenter.Crashes.TestCrashException


### Link to App Center ###


* [https://appcenter.ms/users/hot33331/apps/DotnetCologneXdroid/crashes/errors/1249722133u](https://appcenter.ms/users/hot33331/apps/DotnetCologneXdroid/crashes/errors/1249722133u)
