Subversion exception : diff_editor.c internal malfunction

To whom it mat concern;

I am sending this EMAIL to report a Subversion exception as requested. I was using Tortoise SVN, 1.8.7 Build 25475 - 64 bit 2014/05/05 to perfom a "show log" functionality. While viewing the log I right clicked on the current revision of code (which was 3 revisions newer than mine) and requested "Show changes as unified diff". The execution of this operation was taking a very long time (10 minutes?) and I still saw no result, so I decided to select "cancel" from the progress window. The following error resulted:

---------------------------
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-1.8.7\ext\subversion\subversion\libsvn_wc\diff_editor.c'
line 1623: internal malfunction
---------------------------
OK
Received on 2015-04-24 17:13:58 CEST