gnome-language-selector crashed with AttributeError in check_input_methods(): 'NoneType' object has no attribute 'clear'

我没有等待它完成语言列表载入就关闭它，于是它就崩溃了。
I do not have to wait for it to complete the list of languages ​​loaded on to close it, so that it collapsed.

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: language-selector-gnome 0.99
ProcVersionSignature: Ubuntu 3.8.0-2.6-generic 3.8.0-rc4
Uname: Linux 3.8.0-2-generic x86_64
ApportVersion: 2.8-0ubuntu3
Architecture: amd64
Date: Sat Feb 2 01:29:39 2013
ExecutablePath: /usr/bin/gnome-language-selector
InstallationDate: Installed on 2013-01-21 (10 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130120)
InterpreterPath: /usr/bin/python3.3
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python3.3 /usr/bin/gnome-language-selector
ProcEnviron:
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
 LANG=zh_CN.UTF-8
 LANGUAGE=zh_CN:zh
PythonArgs: ['/usr/bin/gnome-language-selector']
SourcePackage: language-selector
Title: gnome-language-selector crashed with AttributeError in check_input_methods(): 'NoneType' object has no attribute 'clear'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm lpadmin sambashare sudo