In this page error 500 from server:
/index.php?module=UserCountry&action=adminIndex&date=previous7&period=range&idSite=1
In error.log:
2014/11/12 19:55:39 [error] 24491#0: *85 FastCGI sent in stderr: "PHP message: PHP Warning: mysqli_real_connect(): Headers and client library minor version mismatch. Headers:50540 Library:50621 in /var/www/***/stat/core/Tracker/Db/Mysqli.php on line 83
PHP message: PHP Fatal error: Cannot redeclare geoip_country_code_by_name() in /var/www/***/stat/libs/MaxMindGeoIP/geoip.inc on line 1593" while reading response header from upstream, client: 89.112.9.203, server: stat.z-gu.ru, request: "GET /piwik.php?action_name=%D0%A1%D0%BF%D0%B5%D1%86%D0%BF%D1%80%D0%B5%D0%B4%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%B8%D1%8F%20%7C%20Go-Bike%20Evolution&idsite=6&rec=1&r=538978&h=19&m=55&s=14&url=http%3A%2F%2Fwww.***%2Fspecials%2F&urlref=http%3A%2F%2Fwww.***%2F&_id=e35a0f0f09fdcaeb&_idts=1415809615&_idvc=1&_idn=0&_refts=0&_viewts=1415809615&pdf=1&qt=0&realp=0&wma=0&dir=0&fla=1&java=1&gears=0&ag=0&cookie=1&res=1920x1080>_ms=45 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "stat.***"
UPD: fixed in last commit (04b4359)