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app/helpers/activities_helper.rb

@@ -44,6 +44,9 @@ module ActivitiesHelper
   end
 
   def get_container_type(activity)
+    if activity.act.nil?
+      return ['Unknow',0]
+    end
     #问卷
     if activity.act_type == 'Poll'
       return ['Course',activity.act.polls_group_id]