Notice: Undefined index: shipping_carrier_code is returned instead of Required parameter "shipping_carrier_code" is missing

Author: XxXgeoXxX

app/code/Magento/QuoteGraphQl/Model/Resolver/SetShippingMethodsOnCart.php

@@ -69,13 +69,13 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
 
         $shippingMethod = reset($shippingMethods); // This point can be extended for multishipping
 
-        if (!$shippingMethod['cart_address_id']) {
+        if (!array_key_exists('cart_address_id', $shippingMethod)) {
             throw new GraphQlInputException(__('Required parameter "cart_address_id" is missing'));
         }
-        if (!$shippingMethod['shipping_carrier_code']) {
+        if (!array_key_exists('shipping_carrier_code', $shippingMethod)) {
             throw new GraphQlInputException(__('Required parameter "shipping_carrier_code" is missing'));
         }
-        if (!$shippingMethod['shipping_method_code']) {
+        if (!array_key_exists('shipping_method_code', $shippingMethod)) {
             throw new GraphQlInputException(__('Required parameter "shipping_method_code" is missing'));
         }