Index: branches/5.2.x/core/kernel/nparser/nparser.php
===================================================================
diff -u -N -r16513 -r16772
--- branches/5.2.x/core/kernel/nparser/nparser.php	(.../nparser.php)	(revision 16513)
+++ branches/5.2.x/core/kernel/nparser/nparser.php	(.../nparser.php)	(revision 16772)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: nparser.php 16513 2017-01-20 14:10:53Z alex $
+* @version	$Id: nparser.php 16772 2023-11-22 08:42:00Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -970,12 +970,17 @@
 		return $ret;
 	}
 
-	function setCache($name, $value, $expiration = 0)
+	function setCache($name, $value, $expiration = null)
 	{
 		if (!$this->CachingEnabled) {
 			return false;
 		}
 
+		// Don't allow creating a non-expiring caches from a template.
+		if ( (int)$expiration <= 0 ) {
+			$expiration = null;
+		}
+
 		// remeber DataExists in cache, because after cache will be restored
 		// it will not be available naturally (no tags, that set it will be called)
 		$value .= '[DE_MARK:' . (int)$this->DataExists . ']';