diff --git a/app/controllers/seminars_controller.rb b/app/controllers/seminars_controller.rb
index 36ed4ce..657bd18 100644
--- a/app/controllers/seminars_controller.rb
+++ b/app/controllers/seminars_controller.rb
@@ -158,9 +158,11 @@ class SeminarsController < ApplicationController
             unassigned_seminar_signup_ids = unassigned_seminar_signup_ids - sr.all_seminar_signup_ids
           end
           @seminar.unassigned_seminar_signup_ids <<  @seminar_signup.id.to_s
+          @seminar.unassigned_mode_1_seminar_signup_ids <<  @seminar_signup.id.to_s
           @seminar.save
         else
           @seminar.unassigned_seminar_signup_ids <<  @seminar_signup.id.to_s
+          @seminar.unassigned_mode_1_seminar_signup_ids <<  @seminar_signup.id.to_s
           @seminar.save
         end
         extra_text = "<br>#{I18n.t('seminar_signup.serial_number')}: #{@seminar_signup.display_serial_number}"