Application is highly unstable on Mac OS

[Adam-Langley]

I get null references when clicking around in the app - then sometimes it wont launch and just crashes on startup with Null references.

System.NullReferenceException: Object reference not set to an instance of an object
at Xamarin.Forms.Platform.MacOS.NativeToolbarTracker.UpdateTitle () [0x00125] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.NativeToolbarTracker.UpdateToolBar () [0x0011b] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.NativeToolbarTracker.set_Navigation (Xamarin.Forms.NavigationPage value) [0x0008d] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.NavigationPageRenderer.Init () [0x00025] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.NavigationPageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x0000e] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001b] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.MasterDetailPageRenderer.UpdateControllers () [0x00066] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.MasterDetailPageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x0000e] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001b] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.Platform.AddChild (Xamarin.Forms.VisualElement view) [0x00027] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.Platform.WillAppear () [0x0001c] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.PlatformRenderer.ViewWillAppear () [0x00006] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at (wrapper managed-to-native) ObjCRuntime.Messaging.void_objc_msgSend_IntPtr(intptr,intptr,intptr)
at AppKit.NSWindow.set_ContentViewController (AppKit.NSViewController value) [0x00025] in /Library/Frameworks/Xamarin.Mac.framework/Versions/6.10.0.17/src/Xamarin.Mac/NSWindow.g.cs:8926
at Xamarin.Forms.Platform.MacOS.FormsApplicationDelegate.UpdateMainPage () [0x00034] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.FormsApplicationDelegate.SetMainPage () [0x00000] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.FormsApplicationDelegate.DidFinishLaunching (Foundation.NSNotification notification) [0x00041] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at ExpenseAnalysis.MacOS.AppDelegate.DidFinishLaunching (Foundation.NSNotification notification) [0x00025] in /Users/adam.langley/Documents/GitHub/Xamarin-ExpenseAnalysis/ExpenseAnalysis/ExpenseAnalysis.macOS/AppDelegate.cs:45
at (wrapper managed-to-native) AppKit.NSApplication.NSApplicationMain(int,string[])
at AppKit.NSApplication.Main (System.String[] args) [0x00040] in /Library/Frameworks/Xamarin.Mac.framework/Versions/6.10.0.17/src/Xamarin.Mac/AppKit/NSApplication.cs:100
at ExpenseAnalysis.MacOS.MainClass.Main (System.String[] args) [0x00017] in /Users/adam.langley/Documents/GitHub/Xamarin-ExpenseAnalysis/ExpenseAnalysis/ExpenseAnalysis.macOS/Main.cs:13
[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
at Xamarin.Forms.Platform.MacOS.NativeToolbarTracker.UpdateTitle () [0x00125] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.NativeToolbarTracker.UpdateToolBar () [0x0011b] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.NativeToolbarTracker.set_Navigation (Xamarin.Forms.NavigationPage value) [0x0008d] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.NavigationPageRenderer.Init () [0x00025] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.NavigationPageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x0000e] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001b] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.MasterDetailPageRenderer.UpdateControllers () [0x00066] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.MasterDetailPageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x0000e] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x0001b] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.Platform.AddChild (Xamarin.Forms.VisualElement view) [0x00027] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.Platform.WillAppear () [0x0001c] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.PlatformRenderer.ViewWillAppear () [0x00006] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at (wrapper managed-to-native) ObjCRuntime.Messaging.void_objc_msgSend_IntPtr(intptr,intptr,intptr)
at AppKit.NSWindow.set_ContentViewController (AppKit.NSViewController value) [0x00025] in /Library/Frameworks/Xamarin.Mac.framework/Versions/6.10.0.17/src/Xamarin.Mac/NSWindow.g.cs:8926
at Xamarin.Forms.Platform.MacOS.FormsApplicationDelegate.UpdateMainPage () [0x00034] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.FormsApplicationDelegate.SetMainPage () [0x00000] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at Xamarin.Forms.Platform.MacOS.FormsApplicationDelegate.DidFinishLaunching (Foundation.NSNotification notification) [0x00041] in <2d9ebed16df2477bbf17b5b8974ffe3d>:0
at ExpenseAnalysis.MacOS.AppDelegate.DidFinishLaunching (Foundation.NSNotification notification) [0x00025] in /Users/adam.langley/Documents/GitHub/Xamarin-ExpenseAnalysis/ExpenseAnalysis/ExpenseAnalysis.macOS/AppDelegate.cs:45
at (wrapper managed-to-native) AppKit.NSApplication.NSApplicationMain(int,string[])
at AppKit.NSApplication.Main (System.String[] args) [0x00040] in /Library/Frameworks/Xamarin.Mac.framework/Versions/6.10.0.17/src/Xamarin.Mac/AppKit/NSApplication.cs:100
at ExpenseAnalysis.MacOS.MainClass.Main (System.String[] args) [0x00017] in /Users/adam.langley/Documents/GitHub/Xamarin-ExpenseAnalysis/ExpenseAnalysis/ExpenseAnalysis.macOS/Main.cs:13

[RathanakumarSekar]

Hi Adam-Langley,

Thank you for contacting us.

We have resolved the reported issue "Application is highly unstable on Mac OS" and merged the changes to the master branch.

Please let us know if you have any other concerns.

Thanks,
Rathanakumar S