telethon.errors.common.TypeNotFoundError: Could not find a matching Constructor ID

I have a bot that relays messages from 2 telegram chats to my Botfather bot. Bot starts and runs fine but after few mins of being idle it throughs following error.

I am on Python3.7 , Telethon version 0.19.6 I have tried upgrading to latest Telethon but then it does not even starts and gives me workers update error. I have also tried fix provided in #69 but still have same issue.

File "start_forward.py", line 38, in <module>
    client.idle()
  File "/usr/local/lib/python3.7/dist-packages/telethon/telegram_bare_client.py", line 696, in idle
    self._sender.receive(update_state=self.updates)
  File "/usr/local/lib/python3.7/dist-packages/telethon/network/mtproto_sender.py", line 180, in receive
    self._process_msg(remote_msg_id, remote_seq, reader, update_state)
  File "/usr/local/lib/python3.7/dist-packages/telethon/network/mtproto_sender.py", line 234, in _process_msg
    return self._handle_container(msg_id, sequence, reader, state)
  File "/usr/local/lib/python3.7/dist-packages/telethon/network/mtproto_sender.py", line 392, in _handle_container
    if not self._process_msg(inner_msg_id, sequence, reader, state):
  File "/usr/local/lib/python3.7/dist-packages/telethon/network/mtproto_sender.py", line 247, in _process_msg
    obj = reader.tgread_object()
  File "/usr/local/lib/python3.7/dist-packages/telethon/extensions/binary_reader.py", line 143, in tgread_object
    return clazz.from_reader(self)
  File "/usr/local/lib/python3.7/dist-packages/telethon/tl/types/__init__.py", line 20530, in from_reader
    _x = reader.tgread_object()
  File "/usr/local/lib/python3.7/dist-packages/telethon/extensions/binary_reader.py", line 143, in tgread_object
    return clazz.from_reader(self)
  File "/usr/local/lib/python3.7/dist-packages/telethon/tl/types/__init__.py", line 19149, in from_reader
    _message = reader.tgread_object()
  File "/usr/local/lib/python3.7/dist-packages/telethon/extensions/binary_reader.py", line 143, in tgread_object
    return clazz.from_reader(self)
  File "/usr/local/lib/python3.7/dist-packages/telethon/tl/types/__init__.py", line 10676, in from_reader
    _media = reader.tgread_object()
  File "/usr/local/lib/python3.7/dist-packages/telethon/extensions/binary_reader.py", line 141, in tgread_object
    raise TypeNotFoundError(constructor_id)
telethon.errors.common.TypeNotFoundError: Could not find a matching Constructor ID for the TLObject that was supposed to be read with ID 0x7c4414d3. Most likely, a TLObject was trying to be read when it should not be read.