SVN v1.7.1 asserting / crashing - workqueue.c, line 672

Hello ,

WANdisco SVN v1.7.1 server. Updated to 1.7.1 from 1.7.0 because getting the
same problem on 1.7.0. Update did not help to solve an issue.

When using svn cleanup, receiving this assert/crash.

===========================================================================
C:\X\trunk\SRC>svn cleanup
svn: E235000: In file '..\..\..\subversion\libsvn_wc\workqueue.c' line 672: assertion failed (checksum != NULL)

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
===========================================================================

Previous steps was to resolve tree conflict in some directory...
(Using WANdisco SVN v1.7.0 and TortoiseSVN v1.7.0)

Any ideas what to do now?

-- 
Best regards,
 Andrey                          mailto:ogorodnik73_at_mail.ru