Error with "cache all images to Kodi texture cache"

[pünktchen 1258]

I'm on version 1.1.22 of the Emby addon and Kodi 15.1pre

and get this error after a some time, while trying to cache all images to Kodi:

17:39:54 T:21824  NOTICE: Previous line repeats 14 times.
17:39:54 T:21824   ERROR: dll_fgets emulated function failed
17:39:54 T:16060  NOTICE: Thread FileCache start, auto delete: false
17:39:54 T:19832  NOTICE: Previous line repeats 5 times.
17:39:54 T:19832   ERROR: EXCEPTION Thrown (PythonToCppException) : -->Python callback/script returned the following error<--
                                             - NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!
                                            Error Type: <type 'exceptions.UnicodeEncodeError'>
                                            Error Contents: 'ascii' codec can't encode character u'\xf6' in position 40: ordinal not in range(128)
                                            Traceback (most recent call last):
                                              File "C:\Users\Administrator\AppData\Roaming\Kodi\addons\plugin.video.emby\default.py", line 125, in <module>
                                                Main()
                                              File "C:\Users\Administrator\AppData\Roaming\Kodi\addons\plugin.video.emby\default.py", line 71, in __init__
                                                TextureCache().FullTextureCacheSync()
                                              File "C:\Users\Administrator\AppData\Roaming\Kodi\addons\plugin.video.emby\resources\lib\TextureCache.py", line 82, in FullTextureCacheSync
                                                self.CacheTexture(url[0])
                                              File "C:\Users\Administrator\AppData\Roaming\Kodi\addons\plugin.video.emby\resources\lib\TextureCache.py", line 93, in CacheTexture
                                                url = self.double_urlencode(url)
                                              File "C:\Users\Administrator\AppData\Roaming\Kodi\addons\plugin.video.emby\resources\lib\TextureCache.py", line 32, in double_urlencode
                                                text = self.single_urlencode(text)
                                              File "C:\Users\Administrator\AppData\Roaming\Kodi\addons\plugin.video.emby\resources\lib\TextureCache.py", line 37, in single_urlencode
                                                blah = urllib.urlencode({'blahblahblah':text})
                                              File "C:\Program Files (x86)\Kodi\system\python\Lib\urllib.py", line 1332, in urlencode
                                                v = quote_plus(str(v))
                                            UnicodeEncodeError: 'ascii' codec can't encode character u'\xf6' in position 40: ordinal not in range(128)
                                            -->End of Python script error report<--
17:39:54 T:17640   ERROR: XFILE::CDirectory::GetDirectory - Error getting plugin://plugin.video.emby/?mode=texturecache
17:39:54 T:17640   ERROR: CGUIMediaWindow::GetDirectory(plugin://plugin.video.emby/?mode=texturecache) failed