diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 1d328c1e9..61f6118ad 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -764,8 +764,8 @@ class UsersController < ApplicationController
           homework_detail_programing.save if homework_detail_programing
           homework_detail_group.save if homework_detail_group
           if params[:quotes] && !params[:quotes].blank?
-            homework = HomeworkCommon.find params[:quotes].to_i
-            homework.update_attribute(:quotes, homework.quotes+1)
+            quotes_homework = HomeworkCommon.find params[:quotes].to_i
+            quotes_homework.update_attribute(:quotes, quotes_homework.quotes+1)
           end
           if params[:is_in_course] == "1"
             redirect_to homework_common_index_path(:course => homework.course_id)