Index: branches/5.2.x/core/kernel/kbase.php
===================================================================
diff -u -N -r14596 -r14599
--- branches/5.2.x/core/kernel/kbase.php	(.../kbase.php)	(revision 14596)
+++ branches/5.2.x/core/kernel/kbase.php	(.../kbase.php)	(revision 14599)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: kbase.php 14596 2011-09-29 15:46:43Z alex $
+* @version	$Id: kbase.php 14599 2011-09-29 19:58:55Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -775,8 +775,11 @@
 	{
 		$field_options = $this->GetFieldOptions($field, $is_virtual);
 
-		if (!$field_options) {
-			return $field_options;
+		if ( !$field_options ) {
+			$form_name = $this->getFormName();
+			trigger_error('Field "<strong>' . $field . '</strong>" is not defined' . ($form_name ? ' on "<strong>' . $this->getFormName() . '</strong>" form' : '') . ' in "<strong>' . $this->Prefix . '</strong>" unit config', E_USER_WARNING);
+
+			return false;
 		}
 
 		return array_key_exists($option_name, $field_options) ? $field_options[$option_name] : $default;