fix for

Notice: Undefined index: og:image
    in /andreskrey/readability.php/src/HTMLParser.php, line 469

1 files changed, 1 insertions, 1 deletions

diff --git a/src/HTMLParser.php b/src/HTMLParser.php
index 288d8a8..51b7afb 100644
--- a/src/HTMLParser.php
+++ b/src/HTMLParser.php
@@ -451,7 +451,7 @@ class HTMLParser
         }
 
         if (array_key_exists('og:image', $values) || array_key_exists('twitter:image', $values)) {
-            $metadata['image'] = ($values['og:image']) ? $values['og:image'] : $values['twitter:image'];
+            $metadata['image'] = array_key_exists('og:image', $values) ? $values['og:image'] : $values['twitter:image'];
         } else {
             $metadata['image'] = null;
         }