Telethon: AttributeError: 'DraftMessageEmpty' object has no attribute 'message'

today i had an unexpected error for fetching my dialogs.

Traceback (most recent call last):
  File "F:\App\core\main.py", line 233, in get_dialogs
    ls = self.client.get_dialogs(limit=limit)
  File "F:\v_env\lib\site-packages\telethon\telegram_client.py", line 664, in get_dialogs
    dialogs = UserList(self.iter_dialogs(*args, **kwargs))
  File "C:\Python34\lib\collections\__init__.py", line 932, in __init__
    self.data = list(initlist)
  File "F:\v_env\lib\site-packages\telethon\telegram_client.py", line 645, in iter_dialogs
    yield Dialog(self, d, entities, messages)
  File "F:\v_env\lib\site-packages\telethon\tl\custom\dialog.py", line 82, in __init__
    self.draft = Draft(client, dialog.peer, dialog.draft)
  File "F:\v_env\lib\site-packages\telethon\tl\custom\draft.py", line 33, in __init__
    self._text = markdown.unparse(draft.message, draft.entities)
AttributeError: 'DraftMessageEmpty' object has no attribute 'message' 

any idea how to fix it? my codes were OK and run perfectly. 😦