The puzzle `785-b7c2e7d1` from #785 has to be resolved: https://github.com/php-coder/mystamps/blob/7be4e62acf67e49399209dfe1cb5746759cab445/src/main/java/ru/mystamps/web/feature/series/RestSeriesController.java#L44-L44 The puzzle was created by Slava Semushin on 24-May-20.