abrt version: 1.1.17
architecture: x86_64
cmdline: /usr/bin/python /usr/share/system-config-language/system-config-language.py
component: system-config-language
executable: /usr/share/system-config-language/system-config-language.py
kernel: 2.6.35.6-45.fc14.x86_64
package: system-config-language-1.3.5-4.fc14
reason: urllib.py:1169:unquote:AttributeError: 'NoneType' object has no attribute 'split'
release: Fedora release 14 (Laughlin)
time: 1299161782
uid: 0

backtrace
-----
urllib.py:1169:unquote:AttributeError: 'NoneType' object has no attribute 'split'

Traceback (most recent call last):
  File "/usr/share/system-config-language/language_gui.py", line 176, in okClicked
    self.apply()
  File "/usr/share/system-config-language/language_gui.py", line 292, in apply
    install.install_language (self.mainWindow, grpid)
  File "/usr/share/system-config-language/gui_install.py", line 423, in install_language
    dlpkgs = self.downloadPackages(mainWindow)
  File "/usr/share/system-config-language/gui_install.py", line 290, in downloadPackages
    probs = self.downloadPkgs(dlpkgs)
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 1756, in downloadPkgs
    self.plugins.run('predownload', pkglist=pkglist)
  File "/usr/lib/python2.7/site-packages/yum/plugins.py", line 183, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File "/usr/lib/yum-plugins/presto.py", line 581, in predownload_hook
    (problems, more) = downloadPkgs(conduit, pinfo, download_pkgs)
  File "/usr/lib/yum-plugins/presto.py", line 421, in downloadPkgs
    cb.start(text=text, size=rebuild_size)
  File "/usr/lib/python2.7/site-packages/urlgrabber/progress.py", line 127, in start
    self._do_start(now)
  File "/usr/share/system-config-language/gui_install.py", line 247, in _do_start
    txt = _("Downloading %s") %(urllib2.unquote(self.basename),)
  File "/usr/lib64/python2.7/urllib.py", line 1169, in unquote
    res = s.split('%')
AttributeError: 'NoneType' object has no attribute 'split'

Local variables in innermost frame:
s: None

How to reproduce
-----
1.h
2.
3.