diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index 09f04d9a2d..bb581a330b 100644
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -816,7 +816,7 @@ class CuraApplication(QtApplication):
             return
 
         # Compute the center of the objects when their origins are aligned.
-        object_centers = [node.getMeshData().getCenterPosition().scale(node.getScale()) for node in group_node.getChildren()]
+        object_centers = [node.getMeshData().getCenterPosition().scale(node.getScale()) for node in group_node.getChildren() if node.getMeshData()]
         middle_x = sum([v.x for v in object_centers]) / len(object_centers)
         middle_y = sum([v.y for v in object_centers]) / len(object_centers)
         middle_z = sum([v.z for v in object_centers]) / len(object_centers)