Dragging element crashes at certain point

[dannymatkovsky]

I'm trying to implement element dragging with Zingtouch.
I'm able to get the starting pan coordinates, as well as coordinates of every pan event. But when I add new coordinates to element, so it moves with the input, at certain point dragging crashes without any verbose error.
Here's the fiddle: https://jsfiddle.net/burlakko/mdznyerk/34/
Checked in FF and Chrome.