[Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience.

[jcbridwe]

I am getting a warning message and unwanted behavior that is effected a mouse-over tooltipDialog popup that I am using on the geojson layers.The error is :" [Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience." Is this common? I think its related to this function in the geojsonlayer.js file:

_getGeoJsonXhr: function (url) {
// xhr request to get data
var requestHandle = esriRequest({
url: url,
handleAs: "json"
});
requestHandle.then(lang.hitch(this, this._getGeoJson),
lang.hitch(this, this._errorGetGeoJsonXhr));
},

Is there a way to resolve this?