I'd try to create test poll on testwiki with these settings: http://i.imgur.com/nUyk0KS.png
but got this error: [WS2LGgpAAD0AAcvQbEwAAAAA] 2017-05-30 15:09:15: Неустранимое исключение типа «Wikimedia\Rdbms\DBQueryError»: http://i.imgur.com/K5Y8aDe.png