diff --git a/lib/tasks/publick_course.rake b/lib/tasks/publick_course.rake
index 7e6f53a91..1e663067b 100644
--- a/lib/tasks/publick_course.rake
+++ b/lib/tasks/publick_course.rake
@@ -6,11 +6,13 @@ desc "同步精品课数据"
 namespace :public_course do
   task :student => :environment do
 
-
+  if ENV['args']
     subject_id = ENV['args'].split(",").first
     course_id = ENV['args'].split(",").last
     puts "subject_id is #{subject_id}"
     puts "course_id is #{course_id}"
+  end
+
 
     user_ids = Myshixun.find_by_sql("select distinct(user_id) from myshixuns where shixun_id in (select shixun_id from stage_shixuns
                                      where stage_id in (select id from stages where subject_id=#{subject_id}))").map(&:user_id)