diff --git a/app/helpers/exercises_helper.rb b/app/helpers/exercises_helper.rb
index 96507d002..fe29497d0 100644
--- a/app/helpers/exercises_helper.rb
+++ b/app/helpers/exercises_helper.rb
@@ -334,7 +334,7 @@ module ExercisesHelper
       show_unreview_count = nil
     end
 
-    if exercise_status == 2 && exercise_end_time.exists?
+    if exercise_status == 2 && exercise_end_time.present?
       ex_left_time = how_much_time(exercise_end_time)
     else  #已截止后不显示时间
       ex_left_time = nil