bzr crashed with TypeError in quotefn(): expected string or buffer

I was trying to change my commit message but I got an error. The suggestion was to do a 'bzr merge'. That command caused the error.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: bzr 2.4.1-1ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
BzrDebugFlags: set()
BzrVersion: 2.4.1
CommandLine: ['/usr/bin/bzr', 'merge']
CrashDb: bzr
Date: Sun Oct 23 08:05:00 2011
ExecutablePath: /usr/bin/bzr
FileSystemEncoding: UTF-8
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
InterpreterPath: /usr/bin/python2.7
Locale: pt_BR.UTF-8
PackageArchitecture: all
Platform: Linux-3.0.0-12-generic-x86_64-with-Ubuntu-11.10-oneiric
ProcCmdline: /usr/bin/python /usr/bin/bzr merge
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=pt_BR.UTF-8
 LANGUAGE=pt_BR:pt:en
PythonVersion: 2.7.2
SourcePackage: bzr
Title: bzr crashed with TypeError in quotefn(): expected string or buffer
UpgradeStatus: No upgrade log present (probably fresh install)
UserEncoding: UTF-8
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare