message: streaming_level.LoadedLevel returned None
  Tested it in a production scene and some times, streaming_level.LoadedLevel was returning None causing a crash erroring
diff: @@ -11,6 +11,7 @@ for world in ue.all_worlds():
  level_packages.append(world.PersistentLevel.get_outermost())
  for streaming_level in world.StreamingLevels:
  + if streaming_level.LoadedLevel is not None:
  levels.append(streaming_level.LoadedLevel)
  level_packages.append(streaming_level.LoadedLevel.get_outermost())
  