Index: branches/version-2_4-dev/data/class/pages/products/LC_Page_Products_List.php
===================================================================
--- branches/version-2_4-dev/data/class/pages/products/LC_Page_Products_List.php	(revision 18465)
+++ branches/version-2_4-dev/data/class/pages/products/LC_Page_Products_List.php	(revision 18494)
@@ -478,4 +478,7 @@
         if (is_array($arrProduct_id) && !empty($arrProduct_id)) {
             $where .= ' AND product_id IN (' . implode(',', $arrProduct_id) . ')';
+        } else {
+            // 一致させない
+            $where .= ' AND 0<>0';
         }