I'm not sure if you having two vue devices is causing your NULL error or not. However, I frequently experienced a similar "NULL" value error with an Emporia Vue Utility Connect device using this driver. Hitting the "Refresh" command multiple times eventually returns the values for the device than it appears to run fine for a period of time. I don't know what causes the API to return an NULL value but rather than try and figure it out I created the specific driver for the [RELEASE] Emporia Vue Utility Connect Driver I added code that checks for NULL and auto-attempts a refresh up to 5 times that so far has always avoided the "Error" from occurring.
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