Uncaught TypeError: Cannot read property 'top' of undefined

[mattmusc]

I am continuously getting the following error:

'Uncaught TypeError: Cannot read property 'top' of undefined'

var tiles = $el.children(".wp-tiles-tile"), tileOffsetTop = parseInt($el.offset().top), max = 0, newHeight;

I think the error is in the following piece of code, but I cannot understand why.
I boiled down the error to line 767 with the help of the Debugger

Can you help me?

I am using this plugin with Wordpress 4.1

Edit:
I have added the following check:

$el.offset() != undefined

[bxm156]

I have the same problem as well.

[bj-mcduck]

Same here

[bj-mcduck]

This actually breaks the page for IE9 users, which unfortunately is still a thing that's important to my company.