The puzzle `884-b55a3454` from #884 has to be resolved: https://github.com/php-coder/mystamps/blob/9287473f424222a3ead476ee7be30960c2c6dfcf/src/main/java/ru/mystamps/web/controller/CollectionController.java#L57-L57 The puzzle was created by Slava Semushin on 20-Jun-18.