diff --git a/app/views/courses/_join_private_course.html.erb b/app/views/courses/_join_private_course.html.erb
index 6013e14b9..873144afe 100644
--- a/app/views/courses/_join_private_course.html.erb
+++ b/app/views/courses/_join_private_course.html.erb
@@ -73,7 +73,7 @@
             </li>
             <li style="margin-top: 30px;">
               <span style="margin-right: 20px;">身&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;份：</span>
-              <% if User.current.extensions.identity == 0%>
+              <% if User.current.logged? && User.current.extensions &&  User.current.extensions.identity == 0%>
                   <select name="role" class="IDType">
                     <option value="9">教师</option>
                     <option value="7">教辅</option>