.

app/controllers/wechats_controller.rb

@@ -21,8 +21,10 @@ class WechatsController < ActionController::Base
                        pic_url: pic_url,
                        url: url
         end
-        return
+      else
+        request.reply.text "课程邀请码不正确"
       end
+      return
     end
     request.reply.text "您的意见已收到，感谢您的反馈！" # Just echo
   end