Index: nparser.php
===================================================================
--- nparser.php	(revision 15412)
+++ nparser.php	(working copy)
@@ -1194,7 +1194,7 @@
 
 class ParserException extends Exception {
 
-	public function __construct($message = null, $code = 0, Exception $previous = null, $tag = null)
+	public function __construct($message = null, $code = 0, $previous = null, $tag = null)
 	{
 		parent::__construct($message, $code, $previous);