diff --git a/dblayer.php b/dblayer.php
index c6fde44..88f39b8 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -34,22 +34,22 @@ require_once ("domframework/verify.php");
 class dblayer extends PDO
 {
   /** The fields with the definition of type, and special parameters */
-  protected $fields = array ();
+  public $fields = array ();
   /** The primary field */
-  protected $primary = null;
+  public $primary = null;
   /** An array to define the unique fields (or array of unique fields) */
-  protected $unique = null;
+  public $unique = null;
   /** An array to define the foreign keys of the field */
-  protected $foreign = array ();
+  public $foreign = array ();
   /** The db connection */
-  protected $db = null;
+  public $db = null;
   /** The verify unitary stack
       @param string $field The name of the field to test
       @param string $val The value of the field to test */
-  protected function verifyOne ($field, $val) {}
+  public function verifyOne ($field, $val) {}
   /** The verify global stack
       @param array $datas The associative array of contents */
-  protected function verifyAll ($datas) {}
+  public function verifyAll ($datas) {}
   /** Debug of the SQL */
   public $debug = FALSE;
   /** Return all the tables available in the database */
@@ -527,6 +527,9 @@ class dblayer extends PDO
       // Unique fields
       if ($this->unique !== null)
       {
+        if (!is_array ($this->unique))
+          throw new Exception (
+                              _("The Unique field definition is not an array"));
         foreach ($this->unique as $u)
         {
           $sql .= ",\n  UNIQUE (`";