diff --git a/src/AddIns/DisplayBindings/FormsDesigner/Project/Src/Gui/AddComponentsDialog.cs b/src/AddIns/DisplayBindings/FormsDesigner/Project/Src/Gui/AddComponentsDialog.cs
index 3f5055942a..92214ae6e5 100644
--- a/src/AddIns/DisplayBindings/FormsDesigner/Project/Src/Gui/AddComponentsDialog.cs
+++ b/src/AddIns/DisplayBindings/FormsDesigner/Project/Src/Gui/AddComponentsDialog.cs
@@ -68,7 +68,11 @@ namespace ICSharpCode.FormsDesigner.Gui
 		{
 			if (componentListView.Items.Count == 0) {
 				if (componentListView.Controls.Count == 0) {
-					ClearComponentsList(StringParser.Parse("${res:ICSharpCode.SharpDevelop.FormDesigner.Gui.AddSidebarComponents.NoComponentsFound}", new string[,] {{"Name", lastAssembly.FullName}}));
+					string name = String.Empty;
+					if (lastAssembly != null) {
+						name = lastAssembly.FullName;
+					}
+					ClearComponentsList(StringParser.Parse("${res:ICSharpCode.SharpDevelop.FormDesigner.Gui.AddSidebarComponents.NoComponentsFound}", new string[,] {{"Name", name}}));
 				}
 			}
 			componentListView.EndUpdate();