diff --git a/cura/Settings/SettingOverrideDecorator.py b/cura/Settings/SettingOverrideDecorator.py
index a5acb79881..2a903d4a33 100644
--- a/cura/Settings/SettingOverrideDecorator.py
+++ b/cura/Settings/SettingOverrideDecorator.py
@@ -3,7 +3,6 @@
 
 import copy
 import uuid
-from typing import cast
 
 from UM.Scene.SceneNodeDecorator import SceneNodeDecorator
 from UM.Signal import Signal, signalemitter
@@ -13,7 +12,6 @@ from UM.Logger import Logger
 from UM.Util import parseBool
 
 from UM.Application import Application
-from cura.Settings.CuraContainerStack import CuraContainerStack
 
 from cura.Settings.PerObjectContainerStack import PerObjectContainerStack
 from cura.Settings.ExtruderManager import ExtruderManager
@@ -64,8 +62,6 @@ class SettingOverrideDecorator(SceneNodeDecorator):
         if not parseBool(self._extruder_stack.getMetaDataEntry("enabled", "True")):
             # switch to the first extruder that's available
             global_stack = Application.getInstance().getMachineManager().activeMachine
-            if global_stack is None:
-                return
             for _, extruder in sorted(list(global_stack.extruders.items())):
                 if parseBool(extruder.getMetaDataEntry("enabled", "True")):
                     self._extruder_stack = extruder
@@ -86,10 +82,7 @@ class SettingOverrideDecorator(SceneNodeDecorator):
         deep_copy._stack.replaceContainer(0, instance_container)
 
         # Properly set the right extruder on the copy
-        if self._extruder_stack is None:
-            deep_copy._extruder_stack = None
-        else:
-            deep_copy.setActiveExtruder(self._extruder_stack.getId())
+        deep_copy.setActiveExtruder(self._extruder_stack.getId())
 
         # use value from the stack because there can be a delay in signal triggering and "_is_non_printing_mesh"
         # has not been updated yet.
@@ -155,14 +148,12 @@ class SettingOverrideDecorator(SceneNodeDecorator):
                 Application.getInstance().getBackend().needsSlicing()
                 Application.getInstance().getBackend().tickle()
         else:
-            global_stack = Application.getInstance().getGlobalContainerStack()
-            if global_stack:
-                self._stack.setNextStack(cast(CuraContainerStack, global_stack))
+            self._stack.setNextStack(Application.getInstance().getGlobalContainerStack())
 
     ##  Changes the extruder with which to print this node.
     #
     #   \param extruder_stack_id The new extruder stack to print with.
-    def setActiveExtruder(self, extruder_stack_id: str) -> None:
+    def setActiveExtruder(self, extruder_stack_id):
         if self._extruder_stack is None or self._extruder_stack.getId() == extruder_stack_id:
             return