paypal.diff

diff --git a/app/addons/paypal/func.php b/app/addons/paypal/func.php
index 9eb8cff..fad5933 100644
--- a/app/addons/paypal/func.php
+++ b/app/addons/paypal/func.php
@@ -784,3 +784,21 @@ function fn_paypal_get_valid_currency($id)
 
     return $currency;
 }
+
+/**
+ * Overrides user existence check results for guest customers who returned from Express Checkout
+ *
+ * @param int $user_id User ID
+ * @param array $user_data User authentication data
+ * @param boolean $is_exist True if user with specified email already exists
+ */
+function fn_paypal_is_user_exists_post($user_id, $user_data, &$is_exist)
+{
+    if (!$user_id && $is_exist) {
+        if (isset($_SESSION['pp_express_details']['token']) &&
+            (empty($user_data['register_at_checkout']) || $user_data['register_at_checkout'] != 'Y') &&
+            empty($user_data['password1']) && empty($user_data['password2'])) {
+            $is_exist = false;
+        }
+    }
+}
diff --git a/app/addons/paypal/init.php b/app/addons/paypal/init.php
index 7a1b5fd..b917a02 100644
--- a/app/addons/paypal/init.php
+++ b/app/addons/paypal/init.php
@@ -19,5 +19,6 @@ fn_register_hooks(
     'payment_url',
     'update_payment_pre',
     'rma_update_details_post',
-    'prepare_checkout_payment_methods'
+    'prepare_checkout_payment_methods',
+    'is_user_exists_post'
 );