diff --git a/app/views/admin/seminars/_seminar_signup_dashboard.html.erb b/app/views/admin/seminars/_seminar_signup_dashboard.html.erb
index fdc7b68..cc9226d 100644
--- a/app/views/admin/seminars/_seminar_signup_dashboard.html.erb
+++ b/app/views/admin/seminars/_seminar_signup_dashboard.html.erb
@@ -5,7 +5,7 @@
   <h4><%= t("seminar.reviewer") %></h4>
   <% reviewer_show_ids = @seminar.reviewer_show_ids %>
   <% if reviewer_show_ids.nil?
-      reviewer_show_ids = @seminar.reviewer_ids[0..1] 
+      reviewer_show_ids = @seminar.reviewer_ids[0..1] rescue []
       @seminar.update(:reviewer_show_ids=>reviewer_show_ids)
     end
   %>