From 545e37a57f270a8af3f00731c86d9b434957db9c Mon Sep 17 00:00:00 2001
From: Francois Gaillard <francois.gaillard@prestashop.com>
Date: Tue, 27 Nov 2012 11:58:25 +0100
Subject: [PATCH] [-] Classes : Bug fix : Modules, check module instance

---
 classes/module/Module.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/classes/module/Module.php b/classes/module/Module.php
index e76ddd7ad..938148baa 100644
--- a/classes/module/Module.php
+++ b/classes/module/Module.php
@@ -398,8 +398,10 @@ abstract class ModuleCore
 		if (Tools::version_compare($module->version, $module->database_version, '>'))
 		{
 			$module = Module::getInstanceByName($module->name);
-			return $module->loadUpgradeVersionList($module->name, $module->version, $module->database_version);
+			if ($module instanceof Module)
+				return $module->loadUpgradeVersionList($module->name, $module->version, $module->database_version);
 		}
+		return null;
 	}
 
 	/**