Error when setting up RFXTRX sensor

@Guff666 wrote:

I’ve just moved from using a Pi 3B to a Pi 4B. Unfortunately, I also upgraded HA to 110.1 at the same time, so I can’t be sure what causes this problem.

The RFXTRX hub is plugged into a USB2 socket (tried it in the USB3 socket with no difference). The config is:

rfxtrx:
  device: /dev/serial/by-id/usb-RFXCOM_RFXtrx433_A1XETXVE-if00-port0
  debug: true

I also have a package that includes the following:

sensor:
  - platform: rfxtrx
    automatic_add: true
    devices:
      "a520900d30002a61a0279":
        name: Shack Environment
        data_type:
          - Temperature
          - Humidity

I am seeing the following in the log but cannot see why.

Logger: homeassistant.components.sensor
Source: components/rfxtrx/sensor.py:52 
Integration: Sensor (documentation, issues) 
First occurred: 11:22:52 (1 occurrences) 
Last logged: 11:22:52

Error while setting up rfxtrx platform for sensor
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 178, in _async_setup_platform
    await asyncio.wait_for(asyncio.shield(task), SLOW_SETUP_MAX_WAIT)
  File "/usr/local/lib/python3.7/asyncio/tasks.py", line 442, in wait_for
    return fut.result()
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/homeassistant/homeassistant/components/rfxtrx/sensor.py", line 52, in setup_platform
    device_id = "sensor_{}".format(slugify(event.device.id_string.lower()))
AttributeError: 'NoneType' object has no attribute 'device'

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