From 4ab59d0aa80283dbcb38f686f705c61ac75879df Mon Sep 17 00:00:00 2001
From: John Lewin <lewin76@gmail.com>
Date: Thu, 21 Jun 2018 21:44:44 -0700
Subject: [PATCH] Return the default image if rules prevent thumbnail
 generation

---
 Library/ContentProviders/MeshContentProvider.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Library/ContentProviders/MeshContentProvider.cs b/Library/ContentProviders/MeshContentProvider.cs
index 3efcd398a..31acd8739 100644
--- a/Library/ContentProviders/MeshContentProvider.cs
+++ b/Library/ContentProviders/MeshContentProvider.cs
@@ -120,6 +120,11 @@ namespace MatterHackers.MatterControl
 				object3D = await (libraryItem as ILibraryObject3D)?.GetObject3D(null);
 			}
 
+			if (object3D == null)
+			{
+				return DefaultImage;
+			}
+
 			string thumbnailId = libraryItem.ID;
 
 			return GetThumbnail(object3D, thumbnailId, width, height);