system-config-printer.py crashed with KeyError in on_job_retrieve_activate(): 'document-count'

I pressed the "Abrufen" (Call, Access, Fetch) button on an old Job in the print history, because I had no idea what it would do...

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: system-config-printer-gnome 1.3.11+20120807-0ubuntu3
ProcVersionSignature: Ubuntu 3.5.0-11.11-generic 3.5.2
Uname: Linux 3.5.0-11-generic x86_64
ApportVersion: 2.5.1-0ubuntu2
Architecture: amd64
CrashCounter: 1
Date: Sat Aug 25 20:35:21 2012
ExecutablePath: /usr/share/system-config-printer/system-config-printer.py
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120331)
InterpreterPath: /usr/bin/python2.7
Lpstat:
 p11-kit: duplicate configured module: gnome-keyring.module: /usr/lib/x86_64-linux-gnu/pkcs11/gnome-keyring-pkcs11.so
 device for Generic-PCL-6-PCL-XL: socket://192.168.178.3:9100
 device for Kyocera-Mita-FS-1350DN-KPDL: ipp://laser:631/ipp
MachineType: LENOVO 6474A46
PackageArchitecture: all
Papersize: a4
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
PpdFiles:
 Generic-PCL-6-PCL-XL: Generic PCL 6/PCL XL Printer Foomatic/pxlcolor (recommended)
 Kyocera-Mita-FS-1350DN-KPDL: Kyocera FS-1350DN (KPDL)
ProcCmdline: /usr/bin/python /usr/share/system-config-printer/system-config-printer.py --show-jobs Kyocera-Mita-FS-1350DN-KPDL
ProcEnviron:
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-11-generic root=UUID=b32d85c9-d1fb-49ca-8c94-c64d321221b3 ro quiet splash vt.handoff=7
PythonArgs: ['/usr/share/system-config-printer/system-config-printer.py', '--show-jobs', 'Kyocera-Mita-FS-1350DN-KPDL']
SourcePackage: system-config-printer
Title: system-config-printer.py crashed with KeyError in on_job_retrieve_activate(): 'document-count'
Traceback:
 Traceback (most recent call last):
   File "/usr/share/system-config-printer/jobviewer.py", line 1376, in on_job_retrieve_activate
     document_count=attrs['document-count']
 KeyError: 'document-count'
UpgradeStatus: Upgraded to quantal on 2012-08-02 (22 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 04/19/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 7UET86WW (3.16 )
dmi.board.name: 6474A46
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7UET86WW(3.16):bd04/19/2010:svnLENOVO:pn6474A46:pvrThinkPadT400:rvnLENOVO:rn6474A46:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 6474A46
dmi.product.version: ThinkPad T400
dmi.sys.vendor: LENOVO