From 740ce1fa0b06fe2cc7d342eb4ea1deb70785f5de Mon Sep 17 00:00:00 2001
From: fieldOfView <aldo@fieldofview.com>
Date: Wed, 26 Oct 2016 22:58:59 +0200
Subject: [PATCH] Fix errors when switching from UM3 to UM2.

---
 cura/QualityManager.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cura/QualityManager.py b/cura/QualityManager.py
index 7354bfbb4f..52c052ad28 100644
--- a/cura/QualityManager.py
+++ b/cura/QualityManager.py
@@ -161,7 +161,8 @@ class QualityManager:
     #   \return \type{List[InstanceContainer]} a list of the basic materials or an empty list if one could not be found.
     def _getBasicMaterials(self, material_container):
         base_material = material_container.getMetaDataEntry("material")
-        if material_container.getDefinition().getMetaDataEntry("has_machine_quality"):
+        material_container_definition = material_container.getDefinition()
+        if material_container_definition and material_container_definition.getMetaDataEntry("has_machine_quality"):
             definition_id = material_container.getDefinition().getMetaDataEntry("quality_definition", material_container.getDefinition().getId())
         else:
             definition_id = "fdmprinter"