This points to a function that's only used when querying devices using the Brightness, FanSpeed, and Open/Close traits to convert Hubitat's 0-99 percentages to Googles 0-100 range. It seems like it's not getting a result when looking for for the brightness, current fan speed, or open/close percent attributes that you configured for one or more devices. Since it looks like you're using some Brightness traits, double-check those to make sure the brightness attribute configured matches an attribute that the selected devices actually report (that is, one of the things listed under the "Current States" section of the device page in Hubitat).
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