Mac Safari Crash after website load

I have an own wordpress website and every time i go on this site:

http://ift.tt/2b8YMAa

My site crashes on Safari for MacOS. Im on OSX El Capitan 10.11.6. On my other macbook i have the same problem and my brother too with his mac.

If i try to load the website with google chrome it refreshes the site a few times.

Hope you can help me!