diff --git a/dblayeroo.php b/dblayeroo.php
index 9b1d9ef..985402f 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -2816,7 +2816,7 @@ class dblayeroo
       $i = 0;
       foreach (explode (",", $fields) as $key=>$field)
       {
-        if ($values[$field] !== null)
+        if (key_exists ($field, $values) && $values[$field] !== null)
         {
           $objTmp->whereAdd ($parentField[$key], "=", $values[$field]);
           $i++;