Battery Percentage Icon version 2.1.7 has run into an error

[PanJazdan]

System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (Object reference not set to an instance of an object.)
---> System.NullReferenceException: Object reference not set to an instance of an object.
at Wpf.Ui.Controls.NavigationView.UpdateContent(Object content, Object dataContext)
at Wpf.Ui.Controls.NavigationView.NavigateInternal(INavigationViewItem viewItem, Object dataContext, Boolean addToNavigationStack, Boolean isBackwardsNavigated)
at Wpf.Ui.Controls.NavigationView.Navigate(Type pageType, Object dataContext)
at Percentage.App.MainWindow.NavigateToPageT
at Percentage.App.App.b__35_0()
at System.Windows.Threading.DispatcherOperation.InvokeDelegateCore()
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
--- End of inner exception stack trace ---