diff --git a/app/views/layouts/base_contests.html.erb b/app/views/layouts/base_contests.html.erb
index 16993c55d..e10b221a1 100644
--- a/app/views/layouts/base_contests.html.erb
+++ b/app/views/layouts/base_contests.html.erb
@@ -63,7 +63,7 @@
               <%= link_to( "",contest_boards_path(@contest, :flag => true, :is_new => 1), :class => 'sy_class_add', :title =>"#{l(:label_message_new)}") if is_admin %>
             </li>
             <div id="board_children_list">
-              <%= render :partial => 'layouts/contest_board_children_list', :locals => {:contest_board => contest_board} %>
+              <%= render :partial => 'layouts/contest_board_children_list', :locals => {:contest_board => contest_board} if contest_board %>
             </div>
             <li id="sy_05" class="sy_icons_news">
               <%= link_to "通知<span>#{@contest.news.count}</span>".html_safe, contest_news_index_path(@contest), :class => "sy_icons_feedback" %>