diff --git a/app/appapi/controller/v1/Order.php b/app/appapi/controller/v1/Order.php
index 804706bc..076ff386 100644
--- a/app/appapi/controller/v1/Order.php
+++ b/app/appapi/controller/v1/Order.php
@@ -29,7 +29,7 @@ class Order extends ApiController
 
 		//檢查優惠券
 		$update_bonus = false;
-		if(strlen($data['bonus_sn']) == 10){
+		if(isset($data['bonus_sn']) && strlen($data['bonus_sn']) == 10){
 			$bonus = Db::name('bonus')
 			->where('bonus_sn', $data['bonus_sn'])
 			->find();