Bwalarm stopped working

Not sure when but at some point my bwalarm panel stopped working and the only hint of the problem is when I select the alarm panel I see:

There are no errors logged to the homeassistant.log file with default logging and when click to configure the panel I get an entry in the log:

2019-05-24 18:50:02 ERROR (MainThread) [frontend.js.latest.201905140] http://blah.blah.com:1234/api/panel_custom/alarm:1998:37 Uncaught TypeError: Cannot read property ‘classList’ of undefined

I searched but could not find anything obvious and I event cleaned out the alarm.yaml file, but still get the same error. Any pointers? Not sure how to debug this.

There is a fork here that fixes most problems:

Thanks, got the new code and testing…

That did it. Will need to add sensors back in, but I am back up and running and can complete the configuration.

Thanks Tom!!!