If I knew that I would have posted how it happens.
I've not had a single member say anything about this error, I only see them in email.
The same word "śląskie" which I don't even know what language that is.
I personally cannot repoduce the error, I do know it is an ongoing error for months now.
array ( 'type' => 'location_country_state', 'keyword' => 'PL', 'state' => 'śląskie', 'lang' => 'en', )