Thanks for taking the time to report this bug. Unfortunately, we are
not able to fix and find the bug because your description of the bug
didn't have enough information in it. You may find it helpful to read
How to report bugs effectively,
there is another bug opened against this app crashing, so it happens but
it is hard to reproduce.
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xfce4-appfinder is crashing at start time
https://launchpad.net/bugs/53106
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