diff --git a/dblayeroo.php b/dblayeroo.php
index 3e7fcfc..dfe648b 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -2023,7 +2023,7 @@ class dblayeroo
       if (! array_key_exists ($key, $this->fields))
         $this->DBException (sprintf (
           "Invalid field to setValues '%s' : not defined in table", $key));
-      if (! is_string ($val) && ! is_int ($val))
+      if (! is_string ($val) && ! is_int ($val) && ! is_null ($val))
         $this->DBException (sprintf (
           "Invalid field to setValues '%s': not string and not integer", $key));
       $tmpValues[$key] = $val;