Backup issue

Hi all, i run Hassio core-2021.3.4 (latest version) on a Rasp 3B+ and for some reason,in the last days i am unable to make a backup.
When i try to take a snapshot, after some minutes HA give me a message error and in Supervisor log i have this error codes:

21-03-30 21:36:03 ERROR (MainThread) [asyncio] Task exception was never retrieved
future: <Task finished name='Task-798' coro=<HomeAssistantWebSocket.async_supervisor_update_event() done, defined at /usr/src/supervisor/supervisor/homeassistant/> exception=TypeError('Received message 257:None is not str')>
Traceback (most recent call last):
  File "/usr/src/supervisor/supervisor/homeassistant/", line 138, in async_supervisor_update_event
    await self.async_send_command(
  File "/usr/src/supervisor/supervisor/homeassistant/", line 129, in async_send_command
    return await self._client.async_send_command(message)
  File "/usr/src/supervisor/supervisor/homeassistant/", line 46, in async_send_command
    response = await self.client.receive_json()
  File "/usr/local/lib/python3.8/site-packages/aiohttp/", line 291, in receive_json
    data = await self.receive_str(timeout=timeout)
  File "/usr/local/lib/python3.8/site-packages/aiohttp/", line 276, in receive_str
    raise TypeError(f"Received message {msg.type}:{!r} is not str")
TypeError: Received message 257:None is not str

Any suggestion? Thanks

Nevermind,i resolve the issue. I delete home-assistant_v2 database ( it was more then 5GB…) and all is ok now.