abrt version: 1.1.17
architecture: i686
cmdline: /usr/bin/python /usr/bin/zim
comment: I had created some Notebooks and wanted to clean them up, by removing.
component: Zim
executable: /usr/bin/zim
kernel: 2.6.35.11-83.fc14.i686
package: Zim-0.48-1.fc14
reason: notebookdialog.py:339:do_remove_notebook:TypeError: iter should be a GtkTreeIter
release: Fedora release 14 (Laughlin)
time: 1300714683
uid: 500

backtrace
-----
notebookdialog.py:339:do_remove_notebook:TypeError: iter should be a GtkTreeIter

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/zim/gui/notebookdialog.py", line 339, in do_remove_notebook
    model.remove(iter)
TypeError: iter should be a GtkTreeIter

Local variables in innermost frame:
a: (<gtk.Button object at 0x9e8b3ec (GtkButton at 0x9c2a6d0)>,)
model: <NotebookTreeModel object at 0x9e8b284 (GtkListStore at 0x9d66060)>
self: <NotebookDialog object at 0xb72232d4 (zim+gui+widgets+Dialog at 0x9e6c020)>
iter: None

How to reproduce
-----
1. Starting Zim
2. Removing a Notebook
3.