apturl-gtk crashed with UnicodeDecodeError in parseArgs(): 'ascii' codec can't decode byte 0xe3 in position 18: ordinal not in range(128)

TEST CASE:
0. Install a non-english locale like fr or ja
1. In a terminal run the following command:
$ LANG=fr_FR.utf8 apturl-gtk azertyuiop

EXPECTED RESULT:
A dialog pops up displaying a localized error message "Invalid url: 'azertyuiop' given, exiting"

ACTUAL RESULT:
It crashes with the trace below:

-----
Traceback (most recent call last):
  File "/usr/bin/apturl-gtk", line 48, in <module>
    sys.exit(apturl.main())
  File "/usr/lib/python2.7/dist-packages/AptUrl/AptUrl.py", line 172, in main
    apturl_list = self.parseArgs()
  File "/usr/lib/python2.7/dist-packages/AptUrl/AptUrl.py", line 151, in parseArgs
    "%s" % str(e))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 7-8: ordinal not in range(128)
-----

=== Original Description ===

I don't know

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: apturl 0.5.1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-7.13-generic 3.2.0-rc7
Uname: Linux 3.2.0-7-generic i686
ApportVersion: 1.90-0ubuntu1
Architecture: i386
Date: Tue Jan 3 18:50:46 2012
ExecutablePath: /usr/bin/apturl-gtk
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111129.1)
InterpreterPath: /usr/bin/python2.7
ProcCmdline: /usr/bin/python /usr/bin/apturl-gtk /home/username/ドキュメント/Marble Arena 2/bin/arena_32
ProcEnviron:
 PATH=(custom, no user)
 LANG=ja_JP.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/apturl-gtk', '/home/username/\xe3\x83\x89\xe3\x82\xad\xe3\x83\xa5\xe3\x83\xa1\xe3\x83\xb3\xe3\x83\x88/Marble', 'Arena', '2/bin/arena_32']
SourcePackage: apturl
Title: apturl-gtk crashed with UnicodeDecodeError in parseArgs(): 'ascii' codec can't decode byte 0xe3 in position 18: ordinal not in range(128)
UpgradeStatus: Upgraded to precise on 2012-01-02 (1 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo