diff --git a/app/code/Magento/Quote/Model/Quote/Item/CartItemPersister.php b/app/code/Magento/Quote/Model/Quote/Item/CartItemPersister.php
index 85d3ccb3396ee..b2247f333bc3a 100644
--- a/app/code/Magento/Quote/Model/Quote/Item/CartItemPersister.php
+++ b/app/code/Magento/Quote/Model/Quote/Item/CartItemPersister.php
@@ -71,7 +71,9 @@ public function save(CartInterface $quote, CartItemInterface $item)
                     /** Update item product options */
                     $item = $quote->updateItem($itemId, $buyRequestData);
                 } else {
-                    $currentItem->setQty($qty);
+                    if ($item->getQty() !== $currentItem->getQty()) {
+                        $currentItem->setQty($qty);
+                    }
                 }
             } else {
                 /** add new item to shopping cart */
diff --git a/app/code/Magento/Quote/Model/QuoteRepository/SaveHandler.php b/app/code/Magento/Quote/Model/QuoteRepository/SaveHandler.php
index 6b06dbc8c8f13..1bece9a0887ca 100644
--- a/app/code/Magento/Quote/Model/QuoteRepository/SaveHandler.php
+++ b/app/code/Magento/Quote/Model/QuoteRepository/SaveHandler.php
@@ -5,10 +5,8 @@
  */
 namespace Magento\Quote\Model\QuoteRepository;
 
-use Magento\Framework\App\ObjectManager;
 use Magento\Quote\Api\Data\CartInterface;
 use Magento\Framework\Exception\InputException;
-use Magento\Framework\Exception\CouldNotSaveException;
 
 class SaveHandler
 {
@@ -32,11 +30,6 @@ class SaveHandler
      */
     private $shippingAssignmentPersister;
 
-    /**
-     * @var \Magento\Framework\Message\PhraseFactory
-     */
-    private $phraseFactory;
-
     /**
      * @param \Magento\Quote\Model\ResourceModel\Quote $quoteResource
      * @param \Magento\Quote\Model\Quote\Item\CartItemPersister $cartItemPersister
@@ -77,13 +70,6 @@ public function save(CartInterface $quote)
                 }
             }
         }
-        $errors = $quote->getErrors();
-        if (!empty($errors)) {
-            $phraseFactory = $this->getPhraseFactory();
-            throw new CouldNotSaveException(
-                $phraseFactory->create('Following errors occurred on save: %1', $errors)
-            );
-        }
 
         // Billing Address processing
         $billingAddress = $quote->getBillingAddress();
@@ -97,18 +83,6 @@ public function save(CartInterface $quote)
         return $quote;
     }
 
-    /**
-     * @deprecated
-     * @return \Magento\Framework\Message\PhraseFactory
-     */
-    private function getPhraseFactory()
-    {
-        if (!is_object($this->phraseFactory)) {
-            $this->phraseFactory = ObjectManager::getInstance()->get(\Magento\Framework\Message\PhraseFactory::class);
-        }
-        return $this->phraseFactory;
-    }
-
     /**
      * @param \Magento\Quote\Model\Quote $quote
      * @return void