diff --git a/app/api/mobile/apis/activities.rb b/app/api/mobile/apis/activities.rb
index 9d75b8560..c7f8509ae 100644
--- a/app/api/mobile/apis/activities.rb
+++ b/app/api/mobile/apis/activities.rb
@@ -12,7 +12,7 @@ module Mobile
           requires :openid, type: String
         end
         post do
-          user = UserWechat.find_by_openid(params[:openid])
+          user = UserWechat.find_by_openid(params[:openid]).user
           shield_project_ids = ShieldActivity.where("container_type='User' and container_id=#{user.id} and shield_type='Project'").map(&:shield_id)
           shield_course_ids = ShieldActivity.where("container_type='User' and container_id=#{user.id} and shield_type='Course'").map(&:shield_id)
           page = params[:page] ? params[:page] : 0