Index: branches/version-2_13-dev/data/class/SC_Product.php
===================================================================
--- branches/version-2_13-dev/data/class/SC_Product.php	(revision 23513)
+++ branches/version-2_13-dev/data/class/SC_Product.php	(revision 23534)
@@ -380,4 +380,5 @@
 __EOS__;
 
+        $objQuery->andWhere(' T3.classcategory_id is not null AND dtb_classcategory2.classcategory_id is not null ');
         $objQuery->setOrder('T3.rank DESC, dtb_classcategory2.rank DESC'); // XXX
         $arrRet = $objQuery->select($col, $table, '', $params);