diff --git a/app/views/users/_course_form.html.erb b/app/views/users/_course_form.html.erb
index 441dbf459..df77b5659 100644
--- a/app/views/users/_course_form.html.erb
+++ b/app/views/users/_course_form.html.erb
@@ -36,9 +36,9 @@
 							
 						<!-- added by bai	 -->
 							<% @course = Course.find_by_extra(membership.project.identifier)%>
-							<% if @course.nil?&&@course.teacher.nil?&&@course.teacher.show_name.nil? %>
-								<span class="font-lighter" style="float: left"><%= l(:label_main_teacher) %> : <%= link_to(@course.teacher.show_name, user_path(@course.teacher)) %></span>
-								<span  style="float: right; padding-left: 8px" ><%= l(:label_course_term) %> : <%= @course.time %><%= @course.term %></span>							
+							<% unless (@course.nil? || @course.teacher.nil? || @course.teacher.show_name.nil?) %>
+							<span class="font-lighter" style="float: left"><%= l(:label_main_teacher) %> : <%= link_to(@course.teacher.show_name, user_path(@course.teacher)) %></span>
+							<span  style="float: right; padding-left: 8px" ><%= l(:label_course_term) %> : <%= @course.time %><%= @course.term %></span>							
 							<!-- <span class="font_lighter" style="float: right"><%= l(:label_create_time) %> ：<%= format_time(membership.created_on) %></span>	 -->
 							<% end %>							
 						</td></tr>