diff --git a/vendor/magento/module-paypal/Model/Express/Checkout.php b/vendor/magento/module-paypal/Model/Express/Checkout.php
index 389f20c757a..5099f0ccb35 100644
--- a/vendor/magento/module-paypal/Model/Express/Checkout.php
+++ b/vendor/magento/module-paypal/Model/Express/Checkout.php
@@ -1155,8 +1155,18 @@ class Checkout
     protected function prepareGuestQuote()
     {
         $quote = $this->_quote;
+        $billingAddress = $quote->getBillingAddress();
+
+        /* Check if Guest customer provided an email address on checkout page, and in case
+        it was provided, use it as priority, if not, use email address returned from PayPal.
+        (Guest customer can place order two ways: - from checkout page, where guest is asked to provide
+        an email address that later can be used for account creation; - from mini shopping cart, directly
+        proceeding to PayPal without providing an email address */
+        $email = $billingAddress->getOrigData('email') !== null
+            ? $billingAddress->getOrigData('email') : $billingAddress->getEmail();
+
         $quote->setCustomerId(null)
-            ->setCustomerEmail($quote->getBillingAddress()->getEmail())
+            ->setCustomerEmail($email)
             ->setCustomerIsGuest(true)
             ->setCustomerGroupId(\Magento\Customer\Model\Group::NOT_LOGGED_IN_ID);
         return $this;