Ticket #18491: 18491.patch

wp-includes/post-template.php

@@ -1152 +1152 @@
         $id = intval($id);
         $_post = & get_post( $id );
 
-        if ( ('attachment' != $_post->post_type) || !$url = wp_get_attachment_url($_post->ID) )
+        if ( empty($_post) || ('attachment' != $_post->post_type) || !$url = wp_get_attachment_url($_post->ID) )
                 return __('Missing Attachment');
 
         if ( $permalink )