home-assistant-petkit: Failed to login (EU region)

Hi my account is an EU regions and when I try to login via hass integration, I got this error: ! Unknown error occurred

I did not check asia or china account checkboxes.

Logger: aiohttp.server
Source: deps/lib/python3.11/site-packages/petkitaio/petkit_client.py:403
First occurred: 13:53:27 (1 occurrences)
Last logged: 13:53:27

Error handling request
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/aiohttp/web_protocol.py", line 433, in _handle_request
    resp = await request_handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/aiohttp/web_app.py", line 504, in _handle
    resp = await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/aiohttp/web_middlewares.py", line 117, in impl
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/http/security_filter.py", line 85, in security_filter_middleware
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/http/forwarded.py", line 100, in forwarded_middleware
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/http/request_context.py", line 28, in request_context_middleware
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/http/ban.py", line 80, in ban_middleware
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/http/auth.py", line 236, in auth_middleware
    return await handler(request)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/http/view.py", line 148, in handle
    result = await handler(request, **request.match_info)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/config/config_entries.py", line 181, in post
    return await super().post(request, flow_id)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/http/data_validator.py", line 72, in wrapper
    result = await method(view, request, data, *args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/data_entry_flow.py", line 110, in post
    result = await self._flow_mgr.async_configure(flow_id, data)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 297, in async_configure
    result = await self._async_handle_step(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 393, in _async_handle_step
    result: FlowResult = await getattr(flow, method)(user_input)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/petkit/config_flow.py", line 118, in async_step_user
    await async_validate_api(self.hass, email, password, asia_account, china_account)
  File "/config/custom_components/petkit/util.py", line 30, in async_validate_api
    devices_query = await client.get_device_roster()
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/deps/lib/python3.11/site-packages/petkitaio/petkit_client.py", line 176, in get_device_roster
    device_roster = await self._post(url, header, data)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/deps/lib/python3.11/site-packages/petkitaio/petkit_client.py", line 403, in _post
    async with self._session.post(url, headers=headers, data=data, timeout=self.timeout) as resp:
  File "/usr/local/lib/python3.11/site-packages/aiohttp/client.py", line 1141, in __aenter__
    self._resp = await self._coro
                 ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/aiohttp/client.py", line 558, in _request
    resp = await req.send(conn)
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/aiohttp/client_reqrep.py", line 670, in send
    await writer.write_headers(status_line, self.headers)
  File "/usr/local/lib/python3.11/site-packages/aiohttp/http_writer.py", line 129, in write_headers
    buf = _serialize_headers(status_line, headers)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "aiohttp/_http_writer.pyx", line 132, in aiohttp._http_writer._serialize_headers
  File "aiohttp/_http_writer.pyx", line 109, in aiohttp._http_writer.to_str
TypeError: Cannot serialize non-str key None