Index: trunk/core/units/general/cat_tag_processor.php
===================================================================
diff -u -N -r8679 -r8718
--- trunk/core/units/general/cat_tag_processor.php	(.../cat_tag_processor.php)	(revision 8679)
+++ trunk/core/units/general/cat_tag_processor.php	(.../cat_tag_processor.php)	(revision 8718)
@@ -44,7 +44,7 @@
 		 * @param string $id_prefix
 		 * @return string
 		 */
-		function ItemLink($params, $id_prefix)
+		function ItemLink($params, $id_prefix = null)
 		{
 			$params = array_merge($params,  Array('pass' => 'm,'.$this->Prefix) );