plover Error disabling timeout

Describe the bug When I try to disable the timeout for the connection to my keyboard, I get an error and the timeout remains enabled. The following is logged to plover.log

2022-12-05 16:17:33,746 [Dummy-1] ERROR: engine update failed
Traceback (most recent call last):
  File "/Users/runner/work/plover/plover/build/osxapp/Plover.app/Contents/Frameworks/Python.framework/Versions/Current/lib/python3.9/site-packages/plover/engine.py", line 147, in run
  File "/Users/runner/work/plover/plover/build/osxapp/Plover.app/Contents/Frameworks/Python.framework/Versions/Current/lib/python3.9/site-packages/plover/engine.py", line 189, in _update
  File "/Users/runner/work/plover/plover/build/osxapp/Plover.app/Contents/Frameworks/Python.framework/Versions/Current/lib/python3.9/site-packages/plover/config.py", line 396, in update
  File "/Users/runner/work/plover/plover/build/osxapp/Plover.app/Contents/Frameworks/Python.framework/Versions/Current/lib/python3.9/site-packages/plover/config.py", line 202, in validate
TypeError: float() argument must be a string or a number, not 'NoneType'

To Reproduce

From the Plover UI go to Configure -> Machine
Select GeminiPR for the machine
In options, scroll to timeout and disable the "Use timeout" field
Select Ok to apply the change

This gives a error message, and reopening that setting page shows the timeout is still enabled.

Expected behavior The timeout should be disabled.

The reason I want to do this is so that I won't need to manually reconnect my machine every time I log into my computer. But I had trouble finding documentation on this Timeout setting, so if this doesn't do what I suspect, I'm open to alternatives.

Operating system MacOS 13.0 Plover 4.0.0dev12

Keyboard Moonlander Mark 1 from ZSA