Index: trunk/kernel/include/category.php
===================================================================
diff -u -r495 -r525
--- trunk/kernel/include/category.php	(.../category.php)	(revision 495)
+++ trunk/kernel/include/category.php	(.../category.php)	(revision 525)
@@ -1026,6 +1026,7 @@
             case 'modified':
             	$ret = '';
             	$date = $this->Get('Modified');
+            	if(!$date) $date = $this->Get('CreatedOn');
             	if( $element->GetAttributeByName('_tz') )
             	{
             		$date = GetLocalTime($date,$objSession->Get("tz"));