diff --git a/app/views/projects/_course.html.erb b/app/views/projects/_course.html.erb
index 73e3a455b..5584172d4 100644
--- a/app/views/projects/_course.html.erb
+++ b/app/views/projects/_course.html.erb
@@ -56,9 +56,9 @@
<%= content_tag "span","#{l(:label_duration_time)}:", :class => "course-font"%>
<% unless Course.find_by_extra(@project.identifier).nil? %>
- <%= DateTime.parse(Course.find_by_extra(@project.identifier).setup_time.to_s).strftime("%Y年%m月%d日").to_s unless Course.find_by_extra(@project.identifier).setup_time.nil? %>
- <%= '-' unless Course.find_by_extra(@project.identifier).setup_time.nil? %>
- <%= DateTime.parse(Course.find_by_extra(@project.identifier).endup_time.to_s).strftime("%Y年%m月%d日").to_s unless Course.find_by_extra(@project.identifier).endup_time.nil? %>
+ <%= DateTime.parse(Course.find_by_extra(@project.identifier).setup_time.to_s).strftime("%Y年%m月%d日").to_s unless Course.find_by_extra(@project.identifier).setup_time.blank? %>
+ <%= '-' unless Course.find_by_extra(@project.identifier).setup_time.blank? %>
+ <%= DateTime.parse(Course.find_by_extra(@project.identifier).endup_time.to_s).strftime("%Y年%m月%d日").to_s unless Course.find_by_extra(@project.identifier).endup_time.blank? %>
<% end %>