ValueError: file descriptor cannot be a negative integer (-1)

[ratsputin]

When shutting down Home Assistant (whose alarmdecoder component leverages this library), I'm seeing the following error:

2022-02-05 13:49:03 ERROR (Thread-3) [root] Uncaught thread exception
Traceback (most recent call last):
  File "/usr/lib/python3.9/threading.py", line 973, in _bootstrap_inner
    self.run()
  File "/srv/homeassistant/venv/lib/python3.9/site-packages/alarmdecoder/devices/base_device.py", line 148, in run
    self._device.read_line(timeout=self.READ_TIMEOUT)
  File "/srv/homeassistant/venv/lib/python3.9/site-packages/alarmdecoder/devices/socket_device.py", line 323, in read_line
    read_ready, _, _ = select.select([self._device], [], [], 0.5)
ValueError: file descriptor cannot be a negative integer (-1)

Interestingly, this only cropped up since I upgraded from python 3.8 to 3.9. I have, however, seen other error reports with earlier versions.