From 0fb8dc500c809ab8f7432ff2ec4d789fdaa6b4ca Mon Sep 17 00:00:00 2001
From: PhoenixDev - JJ <jan.jaworski@at.phoenix-media.eu>
Date: Tue, 16 Jan 2018 12:19:12 +0100
Subject: [PATCH] Fix exception when no extension attributes have been loaded
 yet

---
 Model/CashOnDelivery.php | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/Model/CashOnDelivery.php b/Model/CashOnDelivery.php
index b97c561..8ea93d1 100644
--- a/Model/CashOnDelivery.php
+++ b/Model/CashOnDelivery.php
@@ -54,14 +54,17 @@ public function isAvailable(\Magento\Quote\Api\Data\CartInterface $quote = null)
             return $available;
         }
 
-        $shippingMethods = $quote->getExtensionAttributes()->getShippingAssignments();
-
-        $disallowedShippingMethods = $this->getDisallowedShippingMethods();
-        foreach ($shippingMethods as $shippingMethod) {
-            if (in_array($shippingMethod->getShipping()->getMethod(), $disallowedShippingMethods)) {
-                $available = false;
+        $extensionAttributes = $quote->getExtensionAttributes();
+        if ($extensionAttributes !== null) {
+            $shippingMethods = $extensionAttributes->getShippingAssignments();
+
+            $disallowedShippingMethods = $this->getDisallowedShippingMethods();
+            foreach ($shippingMethods as $shippingMethod) {
+                if (in_array($shippingMethod->getShipping()->getMethod(), $disallowedShippingMethods)) {
+                    $available = false;
+                }
+                $shippingMethod->getShipping()->getMethod();
             }
-            $shippingMethod->getShipping()->getMethod();
         }
 
         return $available;