From 335bca412c2f699ddfd64ad235b2001f00ef640c Mon Sep 17 00:00:00 2001
From: Ronak Patel <11473750+ronak2ram@users.noreply.github.com>
Date: Sun, 8 Jul 2018 14:28:54 +0530
Subject: [PATCH] Update CustomerFlushFormKey.php

---
 app/code/Magento/Customer/Model/Plugin/CustomerFlushFormKey.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/code/Magento/Customer/Model/Plugin/CustomerFlushFormKey.php b/app/code/Magento/Customer/Model/Plugin/CustomerFlushFormKey.php
index c583af84cce50..213d4ab3527e6 100644
--- a/app/code/Magento/Customer/Model/Plugin/CustomerFlushFormKey.php
+++ b/app/code/Magento/Customer/Model/Plugin/CustomerFlushFormKey.php
@@ -47,7 +47,7 @@ public function aroundExecute(FlushFormKey $subject, callable $proceed, Observer
         $currentFormKey = $this->dataFormKey->getFormKey();
         $proceed($observer);
         $beforeParams = $this->session->getBeforeRequestParams();
-        if ($beforeParams['form_key'] == $currentFormKey) {
+        if (isset($beforeParams['form_key']) && $beforeParams['form_key'] === $currentFormKey) {
             $beforeParams['form_key'] = $this->dataFormKey->getFormKey();
             $this->session->setBeforeRequestParams($beforeParams);
         }