diff --git a/source/Components/AvalonDock/Controls/AnchorablePaneTitle.cs b/source/Components/AvalonDock/Controls/AnchorablePaneTitle.cs
index 1b4c542a..f8a56276 100644
--- a/source/Components/AvalonDock/Controls/AnchorablePaneTitle.cs
+++ b/source/Components/AvalonDock/Controls/AnchorablePaneTitle.cs
@@ -63,7 +63,7 @@ public LayoutAnchorable Model
 		protected virtual void OnModelChanged(DependencyPropertyChangedEventArgs e)
 		{
 			if (Model != null)
-				SetLayoutItem(Model.Root.Manager.GetLayoutItemFromModel(Model));
+				SetLayoutItem(Model?.Root?.Manager?.GetLayoutItemFromModel(Model));
 			else
 				SetLayoutItem(null);
 		}
diff --git a/source/Components/AvalonDock/Controls/LayoutAnchorableControl.cs b/source/Components/AvalonDock/Controls/LayoutAnchorableControl.cs
index aff092e0..a24c5c2c 100644
--- a/source/Components/AvalonDock/Controls/LayoutAnchorableControl.cs
+++ b/source/Components/AvalonDock/Controls/LayoutAnchorableControl.cs
@@ -67,7 +67,7 @@ protected virtual void OnModelChanged(DependencyPropertyChangedEventArgs e)
 			if (Model != null)
 			{
 				Model.PropertyChanged += Model_PropertyChanged;
-				SetLayoutItem(Model.Root.Manager.GetLayoutItemFromModel(Model));
+				SetLayoutItem(Model?.Root?.Manager?.GetLayoutItemFromModel(Model));
 			}
 			else
 				SetLayoutItem(null);
diff --git a/source/Components/AvalonDock/Controls/LayoutDocumentControl.cs b/source/Components/AvalonDock/Controls/LayoutDocumentControl.cs
index 5db5bcbc..0ceeaaea 100644
--- a/source/Components/AvalonDock/Controls/LayoutDocumentControl.cs
+++ b/source/Components/AvalonDock/Controls/LayoutDocumentControl.cs
@@ -63,7 +63,7 @@ protected virtual void OnModelChanged(DependencyPropertyChangedEventArgs e)
 			if (Model != null)
 			{
 				Model.PropertyChanged += Model_PropertyChanged;
-				SetLayoutItem(Model.Root.Manager.GetLayoutItemFromModel(Model));
+				SetLayoutItem(Model?.Root?.Manager?.GetLayoutItemFromModel(Model));
 			}
 			else
 				SetLayoutItem(null);