Index: branches/5.1.x/core/kernel/db/db_tag_processor.php
===================================================================
diff -u -N -r13168 -r13188
--- branches/5.1.x/core/kernel/db/db_tag_processor.php	(.../db_tag_processor.php)	(revision 13168)
+++ branches/5.1.x/core/kernel/db/db_tag_processor.php	(.../db_tag_processor.php)	(revision 13188)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: db_tag_processor.php 13168 2010-02-24 17:26:57Z alex $
+* @version	$Id: db_tag_processor.php 13188 2010-03-10 09:06:05Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -1814,8 +1814,9 @@
 
 		$element_type = $object->GetDBField($params['element_type_field']);
 
-		if($element_type == 'label') $element_type = 'text';
-		$params['name'] = $params['blocks_prefix'].$element_type;
+		if ($element_type == 'label') {
+			$element_type = 'text';
+		}
 
 		switch ($element_type) {
 			case 'select':
@@ -1845,6 +1846,14 @@
 			default:
 				break;
 		}
+
+		if (!$element_type) {
+			trigger_error('Element type missing for "<strong>' . $object->GetDBField('VariableName') . '</strong>" configuration variable.', E_USER_ERROR);
+			return '';
+		}
+
+		$params['name'] = $params['blocks_prefix'] . $element_type;
+
 		return $this->Application->ParseBlock($params, 1);
 	}