diff --git a/app/services/cnmoocs_service.rb b/app/services/cnmoocs_service.rb
index dd07cd57..24a9950e 100644
--- a/app/services/cnmoocs_service.rb
+++ b/app/services/cnmoocs_service.rb
@@ -116,7 +116,7 @@ class CnmoocsService
 
   def source_url(params)
     user_source = UserSource.find_by_user_id(params[:userId])
-    return {error: -1, messages: "用户不存在，请先创建用户"} if user_source
+    return {error: -1, messages: "用户不存在，请先创建用户"} if user_source.blank?
     self.logged_user = user_source.user
     shixun = Shixun.find_by_id(params[:resouceId])
     if shixun.blank?