Crash report from Dynamo 2.6.2.15705

[MikeSheinin]

Issue Description

Please fill in the following information to help us reproduce the issue:

What did you do?

Build a graph that retrieves steel beams from the Revit model.

What did you expect to see?

All frames at specific work set.

What did you see instead?

It's crashed

What packages or external references (if any) were used?

Stack Trace

Object reference not set to an instance of an object.

   at ProtoCore.DSASM.Mirror.ExecutionMirror.GetStringValue(StackValue val, Heap heap, Int32 langblock, Int32 maxArraySize, Int32 maxOutputDepth, Boolean forPrint)
   at ProtoCore.Utils.StringUtils.GetStringValue(StackValue sv, RuntimeCore runtimeCore)
   at ProtoCore.Mirror.MirrorData.GetData(StackValue sv, RuntimeCore runtimeCore)
   at Dynamo.Graph.Nodes.NodeModelExtensions.GetGraphicItemsFromMirrorData(MirrorData mirrorData, List`1 graphicItems)
   at Dynamo.Graph.Nodes.NodeModelExtensions.GetGraphicItemsFromMirrorData(MirrorData mirrorData, List`1 graphicItems)
   at Dynamo.Graph.Nodes.NodeModelExtensions.GetGraphicItemsFromMirrorData(MirrorData mirrorData, List`1 graphicItems)
   at Dynamo.Graph.Nodes.NodeModelExtensions.GeneratedGraphicItems(NodeModel node, EngineController engineController)
   at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext()
   at Dynamo.Applications.ViewModel.RevitWatch3DViewModel.Draw(NodeModel node)
   at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   at Dynamo.Models.DynamoModel.OnEvaluationCompleted(Object sender, EvaluationCompletedEventArgs e)
   at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   at Dynamo.Graph.Workspaces.HomeWorkspaceModel.OnEvaluationCompleted(EvaluationCompletedEventArgs e)
   at Dynamo.Models.DynamoModel.RunCancelImpl(RunCancelCommand command)
   at Dynamo.Models.DynamoModel.ExecuteCommand(RecordableCommand command)
   at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

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OS: Microsoft Windows NT 10.0.19044.0
CLR: 4.0.30319.42000
Dynamo: 2.6.2.15705

[github-actions]

Hello MikeSheinin, thank you for submitting this issue! We are super excited that you want to help us make Dynamo all that it can be. However, we need some more information in order for the Dynamo team to investigate any further.

Can you please fill in the following to the best of your ability:

• Dynamo version
• Operating system.

Additional information:

• Filling in of the provided Template (What did you do, What did you expect to see, What did you see instead, What packages or external references (if any) were used)
• Attaching the Stack Trace (Error message that shows up when Dynamo crashes - You can copy and paste this into the Github Issue)
• Upload a .DYN file that showcases the issue in action and any additional needed files, such as Revit (Note: If you cannot share a project, you can recreate this in a quick mock-up file)
• Upload a Screenshot of the error messages you see (Hover over the offending node and showcase said errors message in the screenshot)
• Reproducible steps on how to create the error in question.