From ab8a39698b678a28786ecbcc5e1399bcb25d808c Mon Sep 17 00:00:00 2001
From: Yorik van Havre <yorik@uncreated.net>
Date: Mon, 10 Dec 2018 19:41:02 -0200
Subject: [PATCH] Arch: small optimization in Arch Reference

---
 src/Mod/Arch/ArchReference.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/Mod/Arch/ArchReference.py b/src/Mod/Arch/ArchReference.py
index 6397f87b51..a7e90e1f34 100644
--- a/src/Mod/Arch/ArchReference.py
+++ b/src/Mod/Arch/ArchReference.py
@@ -323,11 +323,12 @@ class ViewProviderArchReference:
     def updateData(self,obj,prop):
         
         if (prop == "Shape") and hasattr(obj.ViewObject,"UpdateColors") and obj.ViewObject.UpdateColors:
-            colors = obj.Proxy.getColors(obj)
-            if colors:
-                obj.ViewObject.DiffuseColor = colors
-            from DraftGui import todo
-            DraftGui.todo.delay(self.recolorize,obj.ViewObject)
+            if obj.Shape and not obj.Shape.isNull():
+                colors = obj.Proxy.getColors(obj)
+                if colors:
+                    obj.ViewObject.DiffuseColor = colors
+                from DraftGui import todo
+                todo.delay(self.recolorize,obj.ViewObject)
 
     def recolorize(self,vobj):