[-] Installer : Undefined variable due to hook call in objectModel::add()

classes/Hook.php

@@ -269,6 +269,8 @@ class HookCore extends ObjectModel
 			
 			// Get all available payment module
 			$payment_modules = array();
+
+			if (isset($context->shop->id))
 				foreach (Module::getPaymentModules() as $module)
 					$payment_modules[] = $module['name'];