diff --git a/app/controllers/myshixuns_controller.rb b/app/controllers/myshixuns_controller.rb
index ef368b367..c36ad09b6 100644
--- a/app/controllers/myshixuns_controller.rb
+++ b/app/controllers/myshixuns_controller.rb
@@ -265,7 +265,7 @@ class MyshixunsController < ApplicationController
       # params[:evaluate] 实训评测时更新必须给的参数，需要依据该参数做性能统计，其它类型的更新可以跳过
       # 自动保存的时候evaluate为0；点评测的时候为1
       if params[:evaluate] == 1
-        exec_time = @game.challenge.try(:exec_time)
+        exec_time = game.challenge.try(:exec_time)
         @sec_key = generate_identifier(EvaluateRecord, 12)
         record = EvaluateRecord.create!(:user_id => current_user.id, :shixun_id => @myshixun.shixun_id, :game_id => game_id,
                                         :identifier => @sec_key, :exec_time => exec_time)