Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(revision 11384)
+++ wp-includes/pluggable.php	(working copy)
@@ -952,9 +952,9 @@
 	$post    = get_post($comment->comment_post_ID);
 	$user    = get_userdata( $post->post_author );
 	$current_user = wp_get_current_user();
+
+	if ( $comment->user_id == $post->post_author ) return false; // The author moderated a comment on his own post
 	
-	if ( $current_user->ID == $user->ID ) return false; // The author moderated a comment on his own post
-
 	if ('' == $user->user_email) return false; // If there's no email to send the comment to
 
 	$comment_author_domain = @gethostbyaddr($comment->comment_author_IP);