diff --git a/app/controllers/messages_controller.rb b/app/controllers/messages_controller.rb
index 9e36d15f4..c3cb3d8c9 100644
--- a/app/controllers/messages_controller.rb
+++ b/app/controllers/messages_controller.rb
@@ -94,8 +94,8 @@ class MessagesController < ApplicationController
           update_kindeditor_assets_owner ids,@message.id,OwnerTypeHelper::MESSAGE
         end
         # 与我相关动态的记录add start
-        if(@board.course_id>0) #项目的先不管
-          teachers = searchTeacherAndAssistant(@board.course);
+        if(@board && @board.course) #项目的先不管
+          teachers = searchTeacherAndAssistant(@board.course)
           for teacher in teachers
             if(teacher.user_id != User.current.id)
               notify = ActivityNotify.new()
@@ -178,7 +178,7 @@ class MessagesController < ApplicationController
       end
 
       # 与我相关动态的记录add start
-      if(@board.course_id>0) #项目的先不管
+      if(@board && @board.course) #项目的先不管
         notifyto_arr = {}
         notifyto_arr[@topic.author_id] = @topic.author_id
         if( params[:parent_topic] != nil && params[:parent_topic] != '')