diff --git a/app/models/dmsf_mailer.rb b/app/models/dmsf_mailer.rb
index 70877fd8..bfe8e2b3 100644
--- a/app/models/dmsf_mailer.rb
+++ b/app/models/dmsf_mailer.rb
@@ -88,6 +88,7 @@ class DmsfMailer < Mailer
       notify_files = files.select { |file| file.notify? }
       return [] if notify_files.empty?
     end
+    return [] unless project.members
     notify_members = project.members.select do |notify_member|
       notify_user = notify_member.user
       if notify_user == User.current && notify_user.pref.no_self_notified