diff --git a/Library/Widgets/ListView/ListView.cs b/Library/Widgets/ListView/ListView.cs
index 9b9d512f9..041d6cd84 100644
--- a/Library/Widgets/ListView/ListView.cs
+++ b/Library/Widgets/ListView/ListView.cs
@@ -442,7 +442,7 @@ namespace MatterHackers.MatterControl.CustomWidgets
 				else
 				{
 					// List items
-					if (itemModel is ILibraryAssetStream contentModel)
+					if (itemModel != null)
 					{
 						var activeContext = ApplicationController.Instance.DragDropData;
 						if (activeContext.View3DWidget != null)
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 76c50f4ff..348da0aa1 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 76c50f4ff0aac6f311a623cd7f0e7f1c75b1bfc9
+Subproject commit 348da0aa18229337f690783386978b47751c1d54