diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index 0f2bf2f9e..2dc23dc4e 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -1478,9 +1478,10 @@ class HomeworkCommonsController < ApplicationController
                 code_list << {path: path, origin_content: info.origin_content, target_content: info.target_content}
               end
             end
+            # TODO: 这里本来应该前端做的，但是现在页面已经刷不开了。
             copy_user_id = copy_user ? copy_user.id : "--"
             copy_username = copy_user ? copy_user.full_name : "--"
-
+            copy_end_time =  copy_end_time ? copy_end_time : "--"
             {code_rate: code_rate, copy_user_id: copy_user_id, end_time: end_time, final_score: final_score,
              all_score: all_score, copy_end_time: copy_end_time, copy_username: copy_username,
              username: game.user.full_name, code_list: code_list, subject: challenge.subject, position: challenge.position,