another segfault during update

Hi,

In libsvn_wc\crop.c, line 294 (function svn_wc_crop_tree), the
target_entry pointer is NULL.

I already got four crash dumps from different people with this segfault.
I assume the pointer is NULL because the call in the previous line to
apr_hash_get can't find the entry.

Unfortunately, the crash dumps don't tell much. All I can see is that
the update is on a 'normal' local path (i.e., no UNC path, no non-ascii
chars in the path) and the update is done with externals included,
allowing unversioned obstruction, depth -1, sticky depth.
The url also doesn't seem special (https, no escaping needed since all
chars are plain ascii).

Maybe someone can find out why this happens?

Stefan

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