usb-creator-gtk crashed with SIGABRT in raise()

[Mr.Gosh]

When creating an usb stick from an non-offical / ubuntu-mini based ubuntu iso, the creator fails

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: usb-creator-gtk 0.2.47
ProcVersionSignature: Ubuntu 3.8.0-13.23-generic 3.8.3
Uname: Linux 3.8.0-13-generic x86_64
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
CrashCounter: 1
Date: Sun Apr 7 16:05:11 2013
ExecutablePath: /usr/bin/usb-creator-gtk
InstallationDate: Installed on 2013-01-31 (66 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130131)
InterpreterPath: /usr/bin/python3.3
MarkForUpload: True
ProcCmdline: /usr/bin/python3 /usr/bin/usb-creator-gtk
ProcEnviron:
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: usb-creator
StacktraceTop:
 raise () from /lib/x86_64-linux-gnu/libc.so.6
 abort () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /lib/x86_64-linux-gnu/libc.so.6
 __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
Title: usb-creator-gtk crashed with SIGABRT in raise()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers

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StacktraceTop:
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 ?? ()
 ?? ()
 ?? ()