The puzzle `785-f94c9d27` from #785 has to be resolved: https://github.com/php-coder/mystamps/blob/7be4e62acf67e49399209dfe1cb5746759cab445/src/main/java/ru/mystamps/web/feature/series/SeriesServiceImpl.java#L121-L121 The puzzle was created by Slava Semushin on 24-May-20.