Grid sometimes disappears when utilising javascript filtering

I’m getting a strange error whereby sometimes when actioning the javascript filter upon button press the whole grid disappears and throws the following error. It doesn’t always happen though and can’t work out the differentiating factor.

cannot call methods on masonry prior to initialization; attempted to call ‘destroy’

Uncaught DOMException: Failed to execute ‘appendChild’ on ‘Node’: The new child element contains the parent.

Link to site is: http://newwp.newrockstars.com/ but it only messes up sometimes?