Cyrillic tags stopped working

Hi,

Cyrillic tags stopped working on my blog. They surely did in April, where I wrote the latest post: http://konakov.biz/tags/основы/ (visible in the browser as http://konakov.biz/tags/основы/).

Now every tag link has the same url /tags/.html which is not good.

Latin tags work fine.

Please help me solve the problem.

I fixed the problem by downgrading middleman-blog gem to version 4.0.1. Seem like there is an error in 4.0.2.