Index: src/Plugin/Validation/Constraint/TweetVisibleConstraintValidator.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/Plugin/Validation/Constraint/TweetVisibleConstraintValidator.php	(revision 66fdcaa2453b5b587a581b15fb57c1b2d836b6eb)
+++ src/Plugin/Validation/Constraint/TweetVisibleConstraintValidator.php	(date 1554899241000)
@@ -3,9 +3,11 @@
 namespace Drupal\media_entity_twitter\Plugin\Validation\Constraint;
 
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Logger\LoggerChannelInterface;
 use Drupal\media_entity\EmbedCodeValueTrait;
 use Drupal\media_entity_twitter\Plugin\MediaEntity\Type\Twitter;
 use GuzzleHttp\Client;
+use GuzzleHttp\Exception\ClientException;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
@@ -24,21 +26,35 @@
    */
   protected $httpClient;
 
+  /**
+   * The logger channel.
+   *
+   * @var \Drupal\Core\Logger\LoggerChannelInterface
+   */
+  protected $logger;
+
   /**
    * Constructs a new TweetVisibleConstraintValidator.
    *
    * @param \GuzzleHttp\Client $http_client
    *   The http client service.
+   * @param \Drupal\Core\Logger\LoggerChannelInterface $logger
+   *   The logger channel.
    */
-  public function __construct(Client $http_client) {
+  public function __construct(Client $http_client,
+                              LoggerChannelInterface $logger) {
     $this->httpClient = $http_client;
+    $this->logger = $logger;
   }
 
   /**
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
-    return new static($container->get('http_client'));
+    return new static(
+      $container->get('http_client'),
+      $container->get('logger.factory')->get('media_entity_twitter')
+    );
   }
 
   /**
@@ -64,7 +80,16 @@
     }
 
     // Fetch content from the given url.
-    $response = $this->httpClient->get($matches[0][0], ['allow_redirects' => FALSE]);
+    try {
+      $response = $this->httpClient->get($matches[0][0], ['allow_redirects' => FALSE]);
+    }
+    catch (ClientException $e) {
+      $this->logger->warning($e->getMessage());
+      if ($e->getCode() === 404) {
+        $this->context->addViolation($constraint->message);
+        return;
+      }
+    }
 
     if ($response->getStatusCode() == 302 && ($location = $response->getHeader('location'))) {
       $effective_url_parts = parse_url($location[0]);