This trying to access undefined in Firefox raising exception

[Darryl Miles]

uikit/src/js/util/viewport.js

Line 193 in f533977

 viewportElement[`client${ucfirst(prop)}`] - 

Here is a screenshot showing the situation.

I think some kind of defensive coding is required here.

[janschoenherr]

Hi, could you provide a minimal codepen example reproducing the error?