Ticket #52196: 52196.3.diff

src/wp-includes/post.php

@@ -6114 +6114 @@
  *
  * @since 2.1.0
  *
- * @param int  $attachment_id Attachment post ID. Defaults to global $post.
+ * @param int  $attachment_id Attachment post ID. Default 0.
  * @param bool $unfiltered    Optional. If true, filters are not run. Default false.
  * @return array|false {
  *     Attachment metadata. False on failure.
@@ -6130 +6130 @@
 function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
         $attachment_id = (int) $attachment_id;
 
+        if ( ! $attachment_id ) {
+                $post = get_post();
+
+                if ( ! $post ) {
+                        return false;
+                }
+
+                $attachment_id = $post->ID;
+        }
+
         $data = get_post_meta( $attachment_id, '_wp_attachment_metadata', true );
 
         if ( ! $data ) {