Error adding entities for domain sensor with platform google_fit && google_fit: Error on device update!

[fabse-hack]

hi, can anybody help me to get the google_fit integration started?
here are my logs:

2023-09-14 12:36:33.765 ERROR (MainThread) [homeassistant.components.sensor] Error adding entities for domain sensor with platform google_fit
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 507, in async_add_entities
await asyncio.gather(*tasks)
File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 752, in _async_add_entity
await entity.add_to_platform_finish()
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 1002, in add_to_platform_finish
self.async_write_ha_state()
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 730, in async_write_ha_state
self._async_write_ha_state()
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 830, in _async_write_ha_state
state, attr = self._async_generate_attributes()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 774, in _async_generate_attributes
attr.update(self.extra_state_attributes or {})
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/google_fit/sensor.py", line 249, in extra_state_attributes
return self._attributes
^^^^^^^^^^^^^^^^
AttributeError: 'GoogleFitWeightSensor' object has no attribute '_attributes'
2023-09-14 12:36:33.801 ERROR (MainThread) [homeassistant.components.sensor] google_fit: Error on device update!
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 573, in _async_add_entity
await entity.async_device_update(warning=False)
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 938, in async_device_update
await hass.async_add_executor_job(self.update)
File "/usr/local/lib/python3.11/concurrent/futures/thread.py", line 58, in run
result = self.fn(*self.args, **self.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/util/__init__.py", line 190, in wrapper
result = method(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/util/__init__.py", line 190, in wrapper
result = method(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/google_fit/sensor.py", line 430, in update
heartrate_datasources = self._get_datasources('com.google.heart_rate.bpm')
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/google_fit/sensor.py", line 274, in _get_datasources
datasources_request = self._client.users().dataSources().list(
^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'users'