diff --git a/dblayer.php b/dblayer.php
index b528e6e..7a01582 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -331,7 +331,7 @@ class dblayer extends PDO
       }
       else
       {
-        if (array_key_exists ($columns, $datasOK)) continue;
+        if (!array_key_exists ($columns, $datasOK)) continue;
         $select = array ();
         if ($columns !== $this->primary)
           $select[] = array ($this->primary, $updatekey, "!=");