Last.fm plugin does not work with non-ASCII (cyrillic in my case) characters.

[bepcyc]

When I'm listening to a music last.fm plugin scrobbles only the tracks with latin letters, but never with russian letters. I guess there is a problem with encoding or something like this.
Russian letters look good in Web UI and Android app though.

My system is:

• ODROID U3 (ARM)
• Ubuntu 14.04.3 LTS

Here is a stack trace also:

2015-11-03 17:46:00.3969 Error - App: Error getting response from http://ws.audioscrobbler.com/2.0/?format=json
        *** Error Report ***
        Version: 3.0.5781.0
        Command line: /usr/lib/emby-server/MediaBrowser.Server.Mono.exe -programdata /var/lib/emby-server -restartpath /usr/lib/emby-server/restart.sh -ffmpeg /usr/local/bin/ffmpeg -ffprobe /usr/local/bin/ffprobe
        Operating system: Unix 3.8.13.30
        Processor count: 4
        64-Bit OS: False
        64-Bit Process: False
        Program data path: /var/lib/emby-server
        Mono: 4.0.3 (Stable 4.0.3.20/d6946b4 Thu Aug 13 13:34:16 UTC 2015)
        Application Path: /usr/lib/emby-server/MediaBrowser.Server.Mono.exe
        One or more errors occurred.
        System.AggregateException
          at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 
          at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 
          at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 
          at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00000] in <filename unknown>:0 
          at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[System.Net.WebResponse].GetResult () [0x00000] in <filename unknown>:0 
          at MediaBrowser.Common.Implementations.HttpClientManager.HttpClientManager+<SendAsyncInternal>c__async4.MoveNext () [0x00000] in <filename unknown>:0 
        InnerException: System.Net.WebException
        The remote server returned an error: (400) Bad Request.
          at System.Net.HttpWebRequest.CheckFinalStatus (System.Net.WebAsyncResult result) [0x00000] in <filename unknown>:0 
          at System.Net.HttpWebRequest.SetResponseData (System.Net.WebConnectionData data) [0x00000] in <filename unknown>:0