Exception in file update_editor.c

Hi there,

I got this exception message when I was switching from a certain branch to
another.
I tested TortoiseSVN-1.7.7(with subversion 1.7.5),
svn-win32-1.7.5(r1336830) and the
same version on Ubuntu, same failure always happens if I did the same
operation.

Hope that could be solved soon, thanks.

---------------------------
Subversion Exception!
---------------------------
Subversion encountered a serious problem.
Please take the time to report this on the Subversion mailing list
with as much information as possible about what
you were trying to do.
But please first search the mailing list archives for the error message
to avoid reporting the same problem repeatedly.
You can find the mailing list archives at
http://subversion.apache.org/mailing-lists.html

Subversion reported the following
(you can copy the content of this dialog
to the clipboard using Ctrl-C):

In file
 'D:\Development\SVN\Releases\TortoiseSVN-1.7.7\ext\subversion\subversion\libsvn_wc\update_editor.c'
 line 1583: assertion failed (action == svn_wc_conflict_action_edit ||
action
 == svn_wc_conflict_action_delete || action ==
svn_wc_conflict_action_replace)
---------------------------
OK
---------------------------

-- 
Dan Su