diff --git a/classes/Image.php b/classes/Image.php
index a8c26f11a..9cc07da05 100644
--- a/classes/Image.php
+++ b/classes/Image.php
@@ -236,6 +236,7 @@ class ImageCore extends ObjectModel
 		{
 			$image_old = new Image($row['id_image']);
 			$image_new = clone $image_old;
+			unset($image_new->id);
 			$image_new->id_product = (int)$id_product_new;
 			// A new id is generated for the cloned image when calling add()
 			if ($image_new->add())
diff --git a/classes/ObjectModel.php b/classes/ObjectModel.php
index 9b1336867..ee2b27ed8 100644
--- a/classes/ObjectModel.php
+++ b/classes/ObjectModel.php
@@ -270,7 +270,7 @@ abstract class ObjectModelCore
 		$fields = array();
 
 		// Set primary key in fields
-		if ($this->id)
+		if (isset($this->id))
 			$fields[$this->def['primary']] = $this->id;
 
 		// Set id_lang field for multilang fields and id_shop for multishop field
@@ -1259,4 +1259,9 @@ abstract class ObjectModelCore
 				$this->def['fields'][$field]['size'] = $size;
 		}
 	}
+
+	public function getEntity($entity)
+	{
+
+	}
 }