telepathy-butterfly crashed with UnicodeDecodeError in _signal_text_received()

STEPS TO REPRODUCE (From: bug #647806, thanks tetsuo55)
happened when someone with thai in his nick sent me a message

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Binary package hint: telepathy-butterfly

pops up randomly with Empathy

ProblemType: Crash
DistroRelease: Ubuntu 10.10
Package: telepathy-butterfly 0.5.14-1
ProcVersionSignature: Ubuntu 2.6.35-19.28-generic 2.6.35.3
Uname: Linux 2.6.35-19-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Wed Sep 22 14:25:43 2010
ExecutablePath: /usr/lib/telepathy/telepathy-butterfly
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta i386 (20100901.1)
InterpreterPath: /usr/bin/python2.6
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/lib/telepathy/telepathy-butterfly
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.utf8
PythonArgs: ['/usr/lib/telepathy/telepathy-butterfly']
SourcePackage: telepathy-butterfly
Title: telepathy-butterfly crashed with UnicodeDecodeError in _signal_text_received()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare