Execution exception when try to comment deleting article

Project: Antarcticle
Version: Powered by Antarcticle 2.8.622.6e8c99f

Steps:
1. Login http://qa.jtalks.org/antarcticle
2. Create article
3. Open article
4. And open article in the second page
5. Type comment in the first page without posting
6. Delete article in the second page
7. Post comment in the first page
8. Error:

Execution exception[[MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`qa_antarcticle`.`comments`, CONSTRAINT `comment_article_fk` FOREIGN KEY (`article_id`) REFERENCES `articles` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION)]]

Expected result:
Error message "Sorry, article not found"