// Retro-compatibility fix of front controllers

controllers/front/OrderSlipController.php

@@ -47,9 +47,10 @@ class OrderSlipControllerCore extends FrontController
 	 */
 	public function initContent()
 	{
+		parent::initContent();
+
 		$this->context->smarty->assign('ordersSlip', OrderSlip::getOrdersSlip((int)$this->context->cookie->id_customer));
 		$this->setTemplate(_PS_THEME_DIR_.'order-slip.tpl');
-		parent::initContent();
 	}
 }