From 25e6fd8becebbb2ddf180daa8a7eb6561bcb4dc0 Mon Sep 17 00:00:00 2001
From: Lipu Fei <lipu.fei815@gmail.com>
Date: Mon, 13 Aug 2018 13:47:26 +0200
Subject: [PATCH] Fix incorrect type hinting

---
 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 1941324eed..bdb96b373e 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -1183,7 +1183,7 @@ class MachineManager(QObject):
         if not self._global_container_stack.variant:
             self._global_container_stack.variant = self._application.empty_variant_container
 
-    def _setMaterial(self, position: str, container_node: ContainerNode = None) -> None:
+    def _setMaterial(self, position: str, container_node: Optional["ContainerNode"] = None) -> None:
         if self._global_container_stack is None:
             return
         if container_node and container_node.getContainer():