fix

app/models/message_template/issue_expire.rb

@@ -43,6 +43,7 @@ class MessageTemplate::IssueExpire < MessageTemplate
       return '', '', '' unless send_setting
       project = issue&.project
       owner = project&.owner 
+      title = email_title
 
       content = email
       content.gsub!('{receiver}', receiver&.real_name)