Do you only have a Withings scale, correct? or do you also have a watch or others?
My guess is that as my module is just currently a proof of concept, I try to display all the related information (weight, sleep, activity ) but if you do not have the withings device related it crashes.
Also, could you tell me when:
“error TypeError: Cannot read property ‘date’ of undefined”
which line in the MM_Withings.js script is related. It should be written in the debug console. Thanks