This crash was discussed on unmethours.

The issue is that it is currently looking for "Temperature" using istringequal here, here, here, and here, when it really needs to see if "Temperature" is contained within the controlVariable. The three valid "Temperature" choices are Temperature, MaximumTemperature, and MinimumTemperature.

Workaround:
Change Control Variable to Temperature instead of MaximumTemperature or MinimumTemperature. This will show the icon again as well as allow you to delete the SetpointManager from the loop.