From 44cb810c855406a467d5b06a93f84ffc5c101c5c Mon Sep 17 00:00:00 2001
From: Lipu Fei <lipu.fei815@gmail.com>
Date: Wed, 9 Oct 2019 22:28:55 +0200
Subject: [PATCH] If None crash

CURA-6869
---
 cura/Settings/MachineManager.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index b62b3516f6..2fbc5b4fd6 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -619,7 +619,10 @@ class MachineManager(QObject):
         global_container_stack = cura.CuraApplication.CuraApplication.getInstance().getGlobalContainerStack()
         if not global_container_stack:
             return False
-        return self.activeQualityGroup().is_experimental
+        active_quality_group = self.activeQualityGroup()
+        if active_quality_group is None:
+            return False
+        return active_quality_group.is_experimental
 
     @pyqtProperty(str, notify = activeIntentChanged)
     def activeIntentCategory(self) -> str: