diff --git a/app/helpers/exercises_helper.rb b/app/helpers/exercises_helper.rb
index fe29497d0..8174d1eea 100644
--- a/app/helpers/exercises_helper.rb
+++ b/app/helpers/exercises_helper.rb
@@ -723,8 +723,8 @@ module ExercisesHelper
     if ex_time > 0
       exercise_user = exercise.exercise_users.find_by(user_id:user.id)
       time_mill = ex_time * 60   #转为秒
-      exercise_end_time = exercise.end_time.exists? ? exercise.end_time.to_i : 0
-      exercise_user_start = exercise_user&.start_at.exists? ? exercise_user.start_at.to_i : 0
+      exercise_end_time = exercise.end_time.present? ? exercise.end_time.to_i : 0
+      exercise_user_start = exercise_user&.start_at.present? ? exercise_user.start_at.to_i : 0
       #用户未开始答题时，即exercise_user_start为0
       if exercise_user_start == 0
         if (exercise_end_time - time_now_i) > time_mill