diff --git a/cura/PlatformPhysics.py b/cura/PlatformPhysics.py
index 23197dac24..cc2074cc3e 100755
--- a/cura/PlatformPhysics.py
+++ b/cura/PlatformPhysics.py
@@ -60,7 +60,7 @@ class PlatformPhysics:
 
         random.shuffle(nodes)
         for node in nodes:
-            if node is root or type(node) is not SceneNode or node.getBoundingBox() is None:
+            if node is root or not issubclass(type(node), SceneNode) or node.getBoundingBox() is None:
                 continue
 
             bbox = node.getBoundingBox()
diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index 9d7cb62a8e..473dbee31a 100755
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -213,7 +213,7 @@ class CuraEngineBackend(QObject, Backend):
         Logger.log("d", "Going to slice build plate [%s]!" % build_plate_to_be_sliced)
         num_objects = self._numObjects()
         if build_plate_to_be_sliced not in num_objects or num_objects[build_plate_to_be_sliced] == 0:
-            Logger.log("d", "  ## Build plate %s has 0 objects to be sliced, skipping", build_plate_to_be_sliced)
+            Logger.log("d", "Build plate %s has 0 objects to be sliced, skipping", build_plate_to_be_sliced)
             self._invokeSlice()
             return