diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index 7fb9c3b0a2..0ea2c9f977 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -929,6 +929,8 @@ class MachineManager(QObject):
                 quality_changes = quality_changes_list[0]
             else:
                 quality_changes = global_quality_changes
+            if not quality_changes:
+                quality_changes = self._empty_quality_changes_container
 
             material = stack.material
             quality = quality_manager.findQualityByQualityType(quality_type, global_machine_definition, [material])