From a3dea81d7da5a8b402fe613090e3ead7e10339a1 Mon Sep 17 00:00:00 2001
From: fieldOfView <aldo@fieldofview.com>
Date: Sun, 12 Apr 2020 16:11:52 +0200
Subject: [PATCH] Fix typing

---
 cura/UI/ObjectsModel.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cura/UI/ObjectsModel.py b/cura/UI/ObjectsModel.py
index c87f1010a9..6a44e4ff5a 100644
--- a/cura/UI/ObjectsModel.py
+++ b/cura/UI/ObjectsModel.py
@@ -191,7 +191,11 @@ class ObjectsModel(ListModel):
                         per_object_settings_count -= 1 # do not count this mesh type setting
                         break
 
-            extruder_number = int(node.callDecoration("getActiveExtruderPosition"))
+            extruder_position = node.callDecoration("getActiveExtruderPosition")
+            if extruder_position is None:
+                extruder_number = -1
+            else:
+                extruder_number = int(extruder_position)
             if node_mesh_type == "anti_overhang_mesh" or node.callDecoration("isGroup"):
                 # for anti overhang meshes and groups the extruder nr is irrelevant
                 extruder_number = -1