diff --git a/src/Tools/Source/SyntaxVisualizer/SyntaxVisualizerControl/SyntaxVisualizerControl.xaml.cs b/src/Tools/Source/SyntaxVisualizer/SyntaxVisualizerControl/SyntaxVisualizerControl.xaml.cs
index 25f7dbee5f4242415dc94f0350f7952c0dc2a55e..6cdcb3f3cbd6d18265af6f0ef4b9c2b78b496e09 100644
--- a/src/Tools/Source/SyntaxVisualizer/SyntaxVisualizerControl/SyntaxVisualizerControl.xaml.cs
+++ b/src/Tools/Source/SyntaxVisualizer/SyntaxVisualizerControl/SyntaxVisualizerControl.xaml.cs
@@ -778,7 +778,7 @@ private void ConstantValueDetailsMenuItem_Click(object sender, RoutedEventArgs e
                 else
                 {
                     typeTextLabel.Visibility = Visibility.Visible;
-                    typeValueLabel.Content = value.Value.GetType().Name;
+                    typeValueLabel.Content = value.Value?.GetType().Name ?? "<null>";
                     _propertyGrid.SelectedObject = value;
                 }
             }