NullReferenceException when closing file tabs.

[HTD]

Following error occurs randomly on closing tabs. I also experienced full Visual Studio crash after closing last tab.

System.NullReferenceException: Object reference not set to an instance of an object. at CodeNav.CodeNav..ctor(IWpfTextViewHost textViewHost, DTE dte) in C:\projects\codenav\CodeNav\CodeNav.cs:line 64 at CodeNav.CodeNavRightFactory.CreateMargin(IWpfTextViewHost wpfTextViewHost, IWpfTextViewMargin marginContainer) in C:\projects\codenav\CodeNav\CodeNavFactory.cs:line 78 at Microsoft.VisualStudio.Text.Utilities.ContainerMargin.<AddMargins>b__25_1(IWpfTextViewMarginProvider mp) at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.InstantiateExtension[TExtension,TMetadata,TExtensionInstance](Object errorSource, Lazy2 provider, Func2 getter)

[sboulema]

Added more null checking in the next 1.5 release

[xperiandri]

Yep, now works well