diff --git a/classes/CartRule.php b/classes/CartRule.php
index d1afaff90..053034dde 100644
--- a/classes/CartRule.php
+++ b/classes/CartRule.php
@@ -59,7 +59,7 @@ class CartRuleCore extends ObjectModel
 
 	public static $definition = array(
 		'table' => 'cart_rule',
-		'identifier' => 'id_cart_rule',
+		'primary' => 'id_cart_rule',
 		'multilang' => true,
 	);
 
diff --git a/classes/ObjectModel.php b/classes/ObjectModel.php
index d10ccf20b..bd42ae379 100644
--- a/classes/ObjectModel.php
+++ b/classes/ObjectModel.php
@@ -151,7 +151,7 @@ abstract class ObjectModelCore
 			$this->id_shop = Context::getContext()->shop->getID(true);
 
 	 	if (!Validate::isTableOrIdentifier($this->identifier) || !Validate::isTableOrIdentifier($this->table))
-			throw new PrestashopException('Identifier or table format not valid');
+			throw new PrestashopException('Identifier or table format not valid for class '.get_class($this));
 
 		if ($id)
 		{