Index: kernel/db/dbitem.php
===================================================================
--- kernel/db/dbitem.php	(revision 12677)
+++ kernel/db/dbitem.php	(working copy)
@@ -68,6 +68,13 @@
 	*/
 	var $ID;
 
+	/**
+	 * This object is used in cloning operations
+	 *
+	 * @var bool
+	 */
+	var $inCloning = false;
+
 	function kDBItem()
 	{
 		parent::kDBBase();
@@ -1255,7 +1262,7 @@
 
 	function saveCustomFields()
 	{
-		if (!$this->customFields) {
+		if (!$this->customFields || $this->inCloning) {
 			return true;
 		}
 
Index: kernel/utility/temp_handler.php
===================================================================
--- kernel/utility/temp_handler.php	(revision 12677)
+++ kernel/utility/temp_handler.php	(working copy)
@@ -295,7 +295,9 @@
 				$this->RaiseEvent('OnBeforeClone', $master['Prefix'], $special, Array($object->GetId()), $foreign_key);
 			}
 
+			$object->inCloning = true;
 			$res = $mode == 'update' ? $object->Update() : $object->Create();
+			$object->inCloning = false;
 
 			if ($res)
 			{
Index: units/custom_data/custom_data_config.php
===================================================================
--- units/custom_data/custom_data_config.php	(revision 12677)
+++ units/custom_data/custom_data_config.php	(working copy)
@@ -33,7 +33,7 @@
 		'ParentTableKey' => 'ResourceId',
 		'ForeignKey' => 'ResourceId',
 		'AutoDelete' => true,
-		'AutoClone' => false,
+		'AutoClone' => true,
 
 		'CalculatedFields' => Array (
 			'' => Array(),