diff --git a/app/controllers/api/bill_controller.rb b/app/controllers/api/bill_controller.rb
index 0408c858..16ebf256 100644
--- a/app/controllers/api/bill_controller.rb
+++ b/app/controllers/api/bill_controller.rb
@@ -32,7 +32,7 @@ class Api::BillController < Api::ApiController
     #shop detail
     shop_details = Shop.find(1)
 
-    customer= Customer.where('customer_id=' + @sale_data.customer_id)
+    customer= Customer.find(@sale_data.customer_id)
     # get member information
     member_info = Customer.get_member_account(customer)