diff --git a/sources/load/proxy/graphql.js b/sources/load/proxy/graphql.js
index 07ec9a9..524bf91 100644
--- a/sources/load/proxy/graphql.js
+++ b/sources/load/proxy/graphql.js
@@ -1,12 +1,14 @@
-import {ajax} from "../ajax";
+import { ajax } from "../ajax";
+import { callEvent } from "../../webix/customevents";
+import promise from "../../thirdparty/promiz";
 
-function unbox(data){
+function unbox(data) {
 	if (!data || !typeof data === "object" || Array.isArray(data))
 		return data;
 
-	var lkey ="";
+	var lkey = "";
 	var count = 0;
-	for (var key in data){
+	for (var key in data) {
 		count++;
 		if (count == 2) return data;
 		lkey = key;
@@ -16,25 +18,36 @@ function unbox(data){
 }
 
 const GraphQL = {
-	$proxy:true,
-	save:function(data){
+	$proxy: true,
+	save: function (data) {
 		return this.load(data);
 	},
-	load:function(view){
+	load: function (view) {
 		var params = {
 			query: this.source
 		};
-		if (arguments.length === 1){
+		if (arguments.length === 1) {
 			params.variables = view;
 		}
-
+		let x;  // variable to pass the XmlHttpRequest from the post() callback because its `then` handler doesn't receive it
 		return ajax()
 			.headers({ "Content-type": "application/json" })
-			.post(this.url, params)
-			.then(function(data){
-				return unbox(data.json().data);
+			.post(this.url, params, function (text, data, XmlHttpRequest) {
+				x = XmlHttpRequest;
+			}).then((data) => {
+				const parsed = data.json();
+				// GraphQL responses (status codes 2xx) can still contain errors. See https://github.com/apollographql/apollo-server/issues/1709
+				if (parsed.errors) {
+					if (parsed.data === null) {
+						// error only
+						callEvent("onAjaxError", [x]);
+						return promise.defer().reject(x);
+					}
+					return unbox(parsed);	// mixed errors and data
+				}
+				return unbox(parsed.data);	// data only
 			});
 	}
 };
 
-export default GraphQL;
\ No newline at end of file
+export default GraphQL;