Index: branches/5.2.x/core/kernel/utility/validator.php
===================================================================
diff -u -N -r16080 -r16235
--- branches/5.2.x/core/kernel/utility/validator.php	(.../validator.php)	(revision 16080)
+++ branches/5.2.x/core/kernel/utility/validator.php	(.../validator.php)	(revision 16235)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: validator.php 16080 2014-09-19 15:23:59Z alex $
+* @version	$Id: validator.php 16235 2015-09-02 20:00:17Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2011 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -264,13 +264,15 @@
 			return false;
 		}
 
-		// validate string
-		if ( isset($params['max_len']) ) {
-			$res = $res && mb_strlen($val) <= $params['max_len'];
-		}
+		if ( strlen($val) > 0 ) {
+			// Validate string.
+			if ( isset($params['max_len']) ) {
+				$res = $res && mb_strlen($val) <= $params['max_len'];
+			}
 
-		if ( isset($params['min_len']) ) {
-			$res = $res && mb_strlen($val) >= $params['min_len'];
+			if ( isset($params['min_len']) ) {
+				$res = $res && mb_strlen($val) >= $params['min_len'];
+			}
 		}
 
 		if ( !$res ) {