diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index 087f081ae9..3f0a5b9cb2 100755
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -1562,7 +1562,7 @@ class CuraApplication(QtApplication):
             self.callLater(self.openProjectFile.emit, file)
             return
 
-        if Preferences.getInstance().getValue("cura/select_models_on_load"):
+        if self.getPreferences().getValue("cura/select_models_on_load"):
             Selection.clear()
 
         f = file.toLocalFile()
@@ -1619,7 +1619,7 @@ class CuraApplication(QtApplication):
         default_extruder_position = self.getMachineManager().defaultExtruderPosition
         default_extruder_id = self._global_container_stack.extruders[default_extruder_position].getId()
 
-        select_models_on_load = Preferences.getInstance().getValue("cura/select_models_on_load")
+        select_models_on_load = self.getPreferences().getValue("cura/select_models_on_load")
 
         for original_node in nodes:
 
diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index 9aff42a9e1..c1ca2448ce 100755
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -488,7 +488,7 @@ class CuraEngineBackend(QObject, Backend):
             # we got a single scenenode
             if not source.callDecoration("isGroup"):
                 mesh_data = source.getMeshData()
-                if mesh_data and mesh_data.getVertices() is None:
+                if mesh_data is None or mesh_data.getVertices() is None:
                     return
 
             # There are some SceneNodes that do not have any build plate associated, then do not add to the list.