Type error List Element null - JS error

Greetings.

Here I have a basic HTML-js code that I’m doing.

I’m receiving an Type error saying that the ListElement is Null. I don’t get why…

Heres the codes.

https://gist.github.com/jowpurcinelli/66caf4be456a6904beb90e39de93d349/revisions

Would appreciate any help :slight_smile:

I don’t get any error in a JSFiddle (after making this change:

for (var lista of clientes) {

Although the add button doesn’t appear to do anything - document refresh required?

What browser/version?