fix bug

app/controllers/core.server.controller.js

@@ -1046,7 +1046,7 @@ exports.epayReturn = function (req, res, next) {
       trxId: merTrxId,
     },
     (err, result) => {
-      if (err || (result && result.code && result.code === "400")) {
+      if (err || !result || !result.data || result.code === "400") {
         return renderPage(req, res, "frontend/paymentSuccess", {
           data: {
             error_text: "Thanh toán thất bại!",
@@ -1113,7 +1113,7 @@ exports.epayIPN = function (req, res, next) {
   }
 
   ApiRequest.get(urlCheckInvoice + "/" + merTrxId, (err, result) => {
-    if (err || (result && result.code && result.code === "400")) {
+    if (err || !result || !result.data || result.code === "400") {
       return res
         .status(400)
         .json({ code: "99", data: "ERROR_TRX_ID_INCORRECT" });