Ticket #7976: 7976.diff

wp-includes/comment.php

@@ -1488 +1488 @@
  * @return object
  */
 function _close_comments_for_old_posts( $posts ) {
-        if ( !is_single() || !get_option('close_comments_for_old_posts') )
+        if ( empty($posts) || !is_single() || !get_option('close_comments_for_old_posts') )
                 return $posts;
 
         $days_old = (int) get_option('close_comments_days_old');