postr crashed with ValueError in on_remove_activate(): invalid tree path

Crashed when removing the pictures. Similar to bug 350806 closed due to lack of information.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: postr 0.12.4-2
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sun Dec 4 15:37:55 2011
ExecutablePath: /usr/bin/postr
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/postr
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
PythonArgs: ['/usr/bin/postr']
SourcePackage: postr
Title: postr crashed with ValueError in on_remove_activate(): invalid tree path
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/pymodules/python2.7/postr/postr.py", line 391, in on_remove_activate
     self.model.remove(self.model.get_iter(path))
 ValueError: invalid tree path
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare