diff --git a/dblayer.php b/dblayer.php
index ed84872..818aa0c 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -627,7 +627,7 @@ class dblayer extends PDO
       {
         if (!in_array ($f, array_keys ($this->fields)))
           throw new Exception (sprintf (dgettext("domframework",
-                               "Field '%s' not allowed"), $f), 506);
+                               "Field '%s' not allowed"), $f), 500);
       }
     }
     else