SetData with updatePoints parameter is not working correctly with stacked area series with null points

[Izothep]

Expected behaviour

Series should be correctly updated (using setData with updatePoints) with new data no matter if series contains null points.

Actual behaviour

In the case of using null points in stacked area chart, setting new data is not updating series correctly

Live demo with steps to reproduce

http://jsfiddle.net/BlackLabel/y7wmL2x8/26/

Click update button.

Affected browser(s)

All

[KacperMadej]

Workaround: if a series is hidden, then the setData works fine - demo: http://jsfiddle.net/y7wmL2x8/27/