From af3f340fc293851388e3f0bd3a6c91b599fb2e81 Mon Sep 17 00:00:00 2001
From: Arjen Hiemstra <ahiemstra@heimr.nl>
Date: Tue, 18 Apr 2017 17:37:05 +0200
Subject: [PATCH] Handle the fact that findContainers might end up returning
 None

Since we now do not necessarily have a container with the specified
type.
---
 cura/Settings/MachineManager.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index 235ede4808..83f8fe9f0f 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -699,7 +699,7 @@ class MachineManager(QObject):
                 Logger.log("w", "While trying to set the active material, no material was found to replace it.")
                 return
 
-            if old_quality_changes.getId() == "empty_quality_changes":
+            if old_quality_changes and old_quality_changes.getId() == "empty_quality_changes":
                 old_quality_changes = None
 
             self.blurSettings.emit()