diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index aaffc34a6..af1dffe71 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -272,7 +272,7 @@ class HomeworkCommonsController < ApplicationController
   def update_student_score
     work = @homework.student_works.find_by(user_id: current_user.id)
     myshixun = Myshixun.find_by(shixun_id: params[:shixun_id], user_id: current_user.id)
-   ActiveRecord::Base.transaction do
+    ActiveRecord::Base.transaction do
       begin
         if work && myshixun && (work.update_time.nil? || work.update_time < myshixun.updated_at)
           challenge_settings = @homework.homework_challenge_settings