Steps to reproduce:
1. Run program, close it
2. Crash on next start


Stack trace:
Package: f-spot
Version: 0.1.3-1
Severity: grave
Justification: renders package unusable

F-spot works fine the first time it is run, I can import, browse,
add tags etc. However as soon as I quit it, it will no longer run the 
next time, instead it crashes giving this message:

Unhandled Exception: System.NullReferenceException: Object reference not
set to an instance of an object
in <0x001e5> PhotoStore:Query (System.String query)
in <0x005b4> PhotoStore:Query (.Tag[] tags, .DateRange range)
in <0x0002c> FSpot.PhotoQuery:.ctor (.PhotoStore store)
in <0x006fe> MainWindow:.ctor (.Db db)
in <0x00039> FSpot.Core:get_MainWindow ()
in <0x00018> FSpot.Core:Organize ()
in <0x00559> Driver:Main (System.String[] args)

When I delete/move the file .gnome2/f-spot/photos.db it will start
again, but then, of course, all my sorting is gone.

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.12-1-amd64-k8
Locale: LANG=sv_SE.UTF-8, LC_CTYPE=sv_SE.UTF-8 (charmap=UTF-8)

Versions of packages f-spot depends on:
ii  libc6                         2.3.5-7    GNU C Library: Shared libraries an
ii  libdbus-cil                   0.23.4-7   CLI binding for D-BUS interprocess
ii  libexif12                     0.6.12-2   library to parse EXIF files
ii  libgconf2.0-cil               2.3.92-2   CLI binding for GConf 2.0, unstabl
ii  libglade2.0-cil               2.3.92-2   CLI binding for the Glade librarie
ii  libglib2.0-0                  2.8.3-1    The GLib library of C routines
ii  libglib2.0-cil                2.3.92-2   CLI binding for the GLib utility l
ii  libgnome2.0-cil               2.3.92-2   CLI binding for GNOME 2.0, unstabl
ii  libgnomeui-0                  2.10.1-1   The GNOME 2 libraries (User Interf
di  libgnomevfs2-0                2.10.1-5   The GNOME virtual file-system libr
ii  libgphoto2-2                  2.1.6-5.2  gphoto2 digital camera library
ii  libgtk2.0-0                   2.6.10-1   The GTK+ graphical user interface 
ii  libgtk2.0-cil                 2.3.92-2   CLI binding for the Gtk+ toolkit 2
ii  libjpeg62                     6b-10      The Independent JPEG Group's JPEG 
ii  liblcms1                      1.13-1     Color management library
ii  libmono0                      1.1.9.2-1  libraries for the Mono JIT
ii  libsqlite0                    2.8.16-1   SQLite shared library
ii  mono-classlib-1.0             1.1.9.2-1  Mono class library (1.0)
ii  mono-jit                      1.1.9.2-1  fast CLI (.NET) JIT compiler for M

f-spot recommends no packages.

-- no debconf information

Other information:
As Debian maintainer I can't reproduce this on my system, but I've received 3
bug reports of this happening (2 debian, 1 ubuntu). I suspect some photos or
actions may trigger it, which I don't do.