It would probably help if you tell us how to reproduce the issue. That is, tell us what command to run on some public repository to get the assertion, or give us a script (starting with 'svnadmin create') that ends with invoking the assertion.
I'm not sure if this was reported before. Thanks, Daniel Patrick Kursawe wrote on Thu, 24 Jun 2010 at 16:03 -0000: > Hi all, > > I just was asked to report a problem on this mailing list. I was trying to > do a blame for a range of 5000-HEAD including merge info > (using TortoiseSVN). > > In file > 'D:\Development\SVN\Releases\TortoiseSVN-1.6.8\ext\subversion\subversion\libsvn_client\blame.c' > line 487: assertion failed (frb->last_filename == NULL) > > If I don't include merge info, it works fine. > > Please mail directly to me if you need more information / want me to try > something since I am not following this list. > > Bye, > > Patrick > > >