diff --git a/app/models/exercise.rb b/app/models/exercise.rb
index fb2608632..3b3b93f09 100644
--- a/app/models/exercise.rb
+++ b/app/models/exercise.rb
@@ -144,7 +144,7 @@ class Exercise < ApplicationRecord
       pb_time = publish_time
       en_time = end_time
 
-      if end_time <= Time.now && exercise_status != 3
+      if en_time.present? && (en_time <= Time.now) && (exercise_status != 3)
         update_column("exercise_status",3)
       end
     else