diff --git a/app/Helper/OmiPay/Signer.php b/app/Helper/OmiPay/Signer.php
index d30a8c0..e8471d8 100644
--- a/app/Helper/OmiPay/Signer.php
+++ b/app/Helper/OmiPay/Signer.php
@@ -7,7 +7,9 @@ namespace App\Helper\OmiPay;
 class Signer
 {
     public static function sign($params) {
-        $signString =  $params['m_number'] . '&'
+        $mNumber = $params['m_number'] ?? '';
+        $mNumber = $mNumber ? $mNumber : Config::get('app_id');
+        $signString =  $mNumber . '&'
         . $params['timestamp'] . '&'
         . $params['nonce_str'] . '&'
         . Config::get('secret_key');
diff --git a/app/Service/PaymentService.php b/app/Service/PaymentService.php
index 3ab74dd..977ecaf 100644
--- a/app/Service/PaymentService.php
+++ b/app/Service/PaymentService.php
@@ -96,6 +96,9 @@ class PaymentService extends AbstractService
         }
         
         $order = Order::where('order_no', $params['out_order_no'])->where('status', Order::STATUS_WAIT_PAY)->first();
+        if (!$order) {
+            return 'ORDER FAIL';
+        }
         $app = App::where('app_id', $order->app_id)->first();
         $order->status = Order::STATUS_PAYED;
         $order->payed_at = date('Y-m-d H:i:s');
@@ -104,7 +107,7 @@ class PaymentService extends AbstractService
         if (!$order->save()) {
             return 'NOTIFY FAIL';
         }
-        
+
         Log::info('notifyToOut url:' . $order->notify_url, 'omipay');
         $result = Notification::post($order->notify_url, $this->buildNotifyParams($order, $app));
         if ($result != 'SUCCESS') {