diff --git a/src/Wallabag/CoreBundle/Helper/ContentProxy.php b/src/Wallabag/CoreBundle/Helper/ContentProxy.php
index dd9170ad2..f752d37e7 100644
--- a/src/Wallabag/CoreBundle/Helper/ContentProxy.php
+++ b/src/Wallabag/CoreBundle/Helper/ContentProxy.php
@@ -19,6 +19,7 @@ class ContentProxy
 {
     protected $graby;
     protected $tagger;
+    protected $validator;
     protected $logger;
     protected $mimeGuesser;
     protected $fetchingErrorMessage;
@@ -127,7 +128,7 @@ class ContentProxy
             isset($content['open_graph']['og_image']) ? $content['open_graph']['og_image'] : ''
         );
 
-        // if content is an image define as a preview too
+        // if content is an image, define it as a preview too
         if (!empty($content['content_type']) && in_array($this->mimeGuesser->guess($content['content_type']), ['jpeg', 'jpg', 'gif', 'png'], true)) {
             $this->validateAndSetPreviewPicture(
                 $entry,