Hi. 
While searching a solution for “undefined” error on smartphone, I noticed that there was a post, but no solution.
I am having a same problem. 
From Desktop, it works fine.
From Smartphone (Samsung Galaxy), using Chrome, once clicking, the screen says “Underfined” and the no user information/data is the appt. list.

How to solve this? This is a kind of urgent since most of customers are using smartphone.
Thanks.