diff --git a/dblayer.php b/dblayer.php
index 69a1ae6..455378a 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -208,6 +208,9 @@ class dblayer extends PDO
       if ($updatekey === false)
       {
         // Don't check if there is an update : the database is already filled
+        // For autoincrement, in INSERT mode, force the value to null
+        if (in_array ("autoincrement", $params))
+          $datas[$key] = null;
         if (in_array ("not null", $params) && !array_key_exists ($key, $datas))
         {
           $errors[$key] = array ("error", sprintf (dgettext("domframework",
@@ -459,11 +462,6 @@ class dblayer extends PDO
       throw new Exception (dgettext("domframework",
                            "The datas provided to create are not array"),
                            405);
-    foreach ($this->fields as $key=>$params)
-    {
-      if (in_array ("autoincrement", $params))
-        $datas[$key] = null;
-    }
     if (!in_array ($this->primary, $this->unique))
       $this->unique[] = $this->primary;
     $datasOK = array ();