homekit_python: IP Discovery not working on MacOS

Following the example in the README results in an exception.

Platform: macOS Mojave Python 3.6 ( virtual env ) homekit[ip] 0.13.0

Happy to provide more info upon request but hoping this is enough to point me in the right direction.

(venv) Christophers-MacBook-Air:HomekitPythonPlaying christopheryoung$ python3 -m homekit.discover
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/christopheryoung/PycharmProjects/HomekitPythonPlaying/venv/lib/python3.6/site-packages/homekit/discover.py", line 49, in <module>
    results = Controller.discover(args.timeout)
  File "/Users/christopheryoung/PycharmProjects/HomekitPythonPlaying/venv/lib/python3.6/site-packages/homekit/controller/controller.py", line 88, in discover
    return discover_homekit_devices(max_seconds)
  File "/Users/christopheryoung/PycharmProjects/HomekitPythonPlaying/venv/lib/python3.6/site-packages/homekit/zeroconf_impl/__init__.py", line 142, in discover_homekit_devices
    d['category'] = Categories[int(category)]
  File "/Users/christopheryoung/PycharmProjects/HomekitPythonPlaying/venv/lib/python3.6/site-packages/homekit/model/categories.py", line 83, in __getitem__
    raise KeyError('Item {item} not found'.format(item=item))
KeyError: 'Item 22 not found'