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Sticky: js error

This is the website: http://www.operaentertainmentrovigo.it/wordpress/chi-siamo/

And this is the error: Uncaught TypeError: Cannot read property 'top' of undefined

I can't find a solution.

Foundation 6.4.2.

Can you hel me?

sticky

This is the website: http://www.operaentertainmentrovigo.it/wordpress/chi-siamo/

And this is the error: Uncaught TypeError: Cannot read property 'top' of undefined

I can't find a solution.

Foundation 6.4.2.

Can you hel me?