toolbox.py crashed with AttributeError in PreferencesAction_activated()

[P]

Binary package hint: hplip

I have my hp deskjet 970 printer usb connected to a nas box - the nas box shares the printer with the tcpip lpr/lpd protocol

start hp-setup
the auto discovery dialog appears
cancel the dialog

==> crash

ProblemType: Crash
Architecture: i386
Date: Wed Apr 28 15:45:08 2010
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/share/hplip/toolbox.py
InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
InterpreterPath: /usr/bin/python2.6
Lpstat:
 device for dj970: lpd://192.168.0.49/usbprinter
 device for HEWLETT-PACKARD_HEWLETT-PACKARD_DESKJET_970C: dnssd://usbprinter._printer._tcp.local/
 device for PDF: cups-pdf:/
MachineType: AOpen i965GMx-IF
Package: hplip-data 3.9.8-1ubuntu2
PackageArchitecture: all
Papersize: a4
PpdFiles:
 dj970: HP Deskjet 970c hpijs, 3.9.8
 HEWLETT-PACKARD_HEWLETT-PACKARD_DESKJET_970C: HP Deskjet 970c hpijs, 3.9.8.36
 PDF: Generic CUPS-PDF Printer
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-20-generic root=UUID=29e5ffde-1b16-4e9a-bbe4-21751ba11a15 ro quiet splash
ProcCmdline: python /usr/bin/hp-toolbox
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=fr_FR.UTF-8
 LANGUAGE=
ProcVersionSignature: Ubuntu 2.6.31-20.58-generic
PythonArgs: ['/usr/bin/hp-toolbox']
SourcePackage: hplip
Title: toolbox.py crashed with AttributeError in PreferencesAction_activated()
Traceback:
 Traceback (most recent call last):
   File "/usr/share/hplip/ui4/devmgr5.py", line 2022, in PreferencesAction_activated
     self.cur_device.sendEvent(EVENT_USER_CONFIGURATION_CHANGED, self.cur_printer)
 AttributeError: 'NoneType' object has no attribute 'sendEvent'
Uname: Linux 2.6.31-20-generic i686
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare video
XsessionErrors:
 (polkit-gnome-authentication-agent-1:3828): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (firefox:9171): GLib-WARNING **: g_set_prgname() called multiple times
dmi.bios.date: 10/03/2008
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 6.00 PG
dmi.board.name: i965GMx-IF
dmi.board.vendor: AOpen
dmi.board.version: 558EX10I690
dmi.chassis.type: 3
dmi.chassis.vendor: AOpen
dmi.chassis.version: i965GMx-IF
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd10/03/2008:svnAOpen:pni965GMx-IF:pvrAO00001JW:rvnAOpen:rni965GMx-IF:rvr558EX10I690:cvnAOpen:ct3:cvri965GMx-IF:
dmi.product.name: i965GMx-IF
dmi.product.version: AO00001JW
dmi.sys.vendor: AOpen

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #465068, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.