diff --git a/app/code/Magento/Customer/Controller/Adminhtml/Index/InlineEdit.php b/app/code/Magento/Customer/Controller/Adminhtml/Index/InlineEdit.php
index 2d0ee3ae13da4..6753a48d02d6a 100644
--- a/app/code/Magento/Customer/Controller/Adminhtml/Index/InlineEdit.php
+++ b/app/code/Magento/Customer/Controller/Adminhtml/Index/InlineEdit.php
@@ -6,13 +6,15 @@
 namespace Magento\Customer\Controller\Adminhtml\Index;
 
 use Magento\Backend\App\Action;
+use Magento\Customer\Api\CustomerRepositoryInterface;
+use Magento\Customer\Api\Data\CustomerInterface;
 use Magento\Customer\Model\EmailNotificationInterface;
-use Magento\Customer\Test\Block\Form\Login;
 use Magento\Customer\Ui\Component\Listing\AttributeRepository;
-use Magento\Customer\Api\Data\CustomerInterface;
-use Magento\Customer\Api\CustomerRepositoryInterface;
+use Magento\Framework\Message\MessageInterface;
 
 /**
+ * Customer inline edit action
+ *
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
 class InlineEdit extends \Magento\Backend\App\Action
@@ -101,7 +103,11 @@ private function getEmailNotification()
     }
 
     /**
+     * Inline edit action execute
+     *
      * @return \Magento\Framework\Controller\Result\Json
+     * @throws \Magento\Framework\Exception\LocalizedException
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
      */
     public function execute()
     {
@@ -249,7 +255,7 @@ protected function processAddressData(array $data)
     protected function getErrorMessages()
     {
         $messages = [];
-        foreach ($this->getMessageManager()->getMessages()->getItems() as $error) {
+        foreach ($this->getMessageManager()->getMessages()->getErrors() as $error) {
             $messages[] = $error->getText();
         }
         return $messages;
@@ -262,7 +268,7 @@ protected function getErrorMessages()
      */
     protected function isErrorExists()
     {
-        return (bool)$this->getMessageManager()->getMessages(true)->getCount();
+        return (bool)$this->getMessageManager()->getMessages(true)->getCountByType(MessageInterface::TYPE_ERROR);
     }
 
     /**
diff --git a/app/code/Magento/Customer/Test/Unit/Controller/Adminhtml/Index/InlineEditTest.php b/app/code/Magento/Customer/Test/Unit/Controller/Adminhtml/Index/InlineEditTest.php
index 913c41070856e..78d9dd7003522 100644
--- a/app/code/Magento/Customer/Test/Unit/Controller/Adminhtml/Index/InlineEditTest.php
+++ b/app/code/Magento/Customer/Test/Unit/Controller/Adminhtml/Index/InlineEditTest.php
@@ -6,6 +6,7 @@
 namespace Magento\Customer\Test\Unit\Controller\Adminhtml\Index;
 
 use Magento\Customer\Model\EmailNotificationInterface;
+use Magento\Framework\Message\MessageInterface;
 
 /**
  * @SuppressWarnings(PHPMD.TooManyFields)
@@ -242,10 +243,11 @@ protected function prepareMocksForErrorMessagesProcessing()
             ->method('getMessages')
             ->willReturn($this->messageCollection);
         $this->messageCollection->expects($this->once())
-            ->method('getItems')
+            ->method('getErrors')
             ->willReturn([$this->message]);
         $this->messageCollection->expects($this->once())
-            ->method('getCount')
+            ->method('getCountByType')
+            ->with(MessageInterface::TYPE_ERROR)
             ->willReturn(1);
         $this->message->expects($this->once())
             ->method('getText')