--- pages/comment/CommentHandler.inc.php	2010-12-06 15:48:01.000000000 -0800
+++ pages/comment/CommentHandler.inc.php	2010-12-06 15:48:28.000000000 -0800
@@ -91,6 +91,7 @@
 		$this->validate($paperId);
 		$paper =& $this->paper;
 
+		$commentDao =& DAORegistry::getDAO('CommentDAO');
 		$parent =& $commentDao->getComment($parentId, $paperId);
 		if (isset($parent) && $parent->getPaperId() != $paperId) {
 			Request::redirect(null, null, null, 'view', array($paperId, $galleyId));