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DYN-10493: Fix crash in Getting Started guided tour #17111

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Merged
jasonstratton merged 1 commit into from
May 19, 2026
+5 −2
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DYN-10493: Fix crash in Getting Started guided tour #17111

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7 changes: 5 additions & 2 deletions src/DynamoCoreWpf/UI/GuidedTour/GuidesValidationMethods.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -697,10 +697,13 @@ internal static void HighlightPort(Step stepInfo, StepUIAutomation uiAutomationD
//Once we have the ItemsControl we get the ContentPresenter
var inputViewModel = inPorts.FirstOrDefault(x => x.PortName == (string)uiAutomationData.Parameters[3]);
var dependencyObject = itemsControlPort.ItemContainerGenerator.ContainerFromItem(inputViewModel);


Grid mainGrid = dependencyObject.ChildOfType<Grid>();

// ContainerFromItem returns null when the ItemsControl hasn't generated the
// container yet (e.g. timing race during guided-tour initialization). Skip the
// highlight rather than crash — the tour can continue without it.
if (mainGrid == null) return;

if (enableFunction)
{
//Creates the highlight rectangle so it can be added and shown over the port
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