abrt version: 1.1.18
architecture: i686
cmdline: /usr/bin/python /usr/bin/zim
component: Zim
executable: /usr/bin/zim
kernel: 2.6.35.13-91.fc14.i686
package: Zim-0.52-1.fc14
reason: pageindex.py:133:on_changed:ValueError: invalid tree path
release: Fedora release 14 (Laughlin)
time: 1305047680
uid: 500

backtrace
-----
pageindex.py:133:on_changed:ValueError: invalid tree path

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/zim/gui/pageindex.py", line 133, in on_changed
    treeiter = self.get_iter(treepath)
ValueError: invalid tree path

Local variables in innermost frame:
path: <IndexPath: interventi:147>
signal: 'row-inserted'
treepath: (6, 0)
o: <Index object at 0xa2e87fc (zim+index+Index at 0xa379190)>
self: <PageTreeStore object at 0xa2f4144 (zim+gui+pageindex+PageTreeStore at 0xa32b660)>

How to reproduce
-----
1. i started zim
2. the index column is empty
3. i rebuild index (tools -> rebuild index)