materialize: getWavesEffectElement throws error with any svg left/right click - Need to do null checking

Since you wire up a click event in the body document.body.addEventListener(‘mousedown’, showEffect, false);

you need to add some additional null checks to the getWavesEffectElement function. Otherwise using libraries like google charts will cause errors to be thrown because you all use the same css class names and they have structured their elements different than you structured yours.

Please see comments below to see where null checks need to be added

 getWavesEffectElement(e) {
        if (TouchHandler.allowEvent(e) === false) {
            return null;
        }

        var element = null;
        var target = e.target || e.srcElement;

//added target 
        while (target && target.parentElement !== null) {
//added target.className
            if (target.className && !(target instanceof SVGElement) && target.className.indexOf('waves-effect') !== -1) {
                element = target;
                break;
            } 
//added target.classList
          else if (target.classList && target.classList.contains('waves-effect')) {
                element = target;
                break;
            }
            target = target.parentElement;
        }

        return element;
    }