diff --git a/cura/Scene/ConvexHullDecorator.py b/cura/Scene/ConvexHullDecorator.py
index 898e3546dd..bca3cdc240 100644
--- a/cura/Scene/ConvexHullDecorator.py
+++ b/cura/Scene/ConvexHullDecorator.py
@@ -381,7 +381,8 @@ class ConvexHullDecorator(SceneNodeDecorator):
         :return: New Polygon instance that is offset with everything that
         influences the collision area.
         """
-
+        if not self._global_stack:  # Should never happen.
+            return convex_hull
         scale_factor = self._global_stack.getProperty("material_shrinkage_percentage", "value") / 100.0
         result = convex_hull
         if scale_factor != 1.0: