diff --git a/app/views/layouts/base_courses.html.erb b/app/views/layouts/base_courses.html.erb
index 7c1a8c03d..057f7c037 100644
--- a/app/views/layouts/base_courses.html.erb
+++ b/app/views/layouts/base_courses.html.erb
@@ -78,7 +78,7 @@
 											<tr>
 												<td valign="top" style="padding-left: 8px;">课程学期：</td><td class="font_lighter_sidebar"><%= @course.term %></td>
 											</tr>
-											<% unless @course.teacher.user_extensions.occupation==""%>											
+											<% unless @course.teacher.user_extensions.nil?%>											
 											<tr>
 												<td valign="top" style="padding-left: 8px;">教师单位：</td><td class="font_lighter_sidebar"><%= @course.teacher.user_extensions.occupation %></td>
 											</tr>