diff --git a/framework/base/helper.class.php b/framework/base/helper.class.php
index e8fb36f49d..0ea5c8bc5e 100644
--- a/framework/base/helper.class.php
+++ b/framework/base/helper.class.php
@@ -251,7 +251,7 @@ class baseHelper
     {
         if(is_array($idList))
         {
-            foreach($idList as $key=>$value) $idList[$key] = addslashes($value);
+            foreach($idList as $key => $value) $idList[$key] = empty($value) ? '' : addslashes($value);
             return "IN ('" . join("','", $idList) . "')";
         }