assertion hit in svn merge

The removal of a directory called "kspread" was (wrongly) committed in revision 420162.

To revert that, I tried
$ svn merge -r420162:420161 svn+ssh://dfaure@svn.kde.org/home/kde/branches/stable/l10n/it/docs/koffice/kspread
svn: File not found: revision 420203, path '/branches/stable/l10n/it/docs/koffice/kspread'
Well, of course it doesn't exist anymore, I want to revert its removal.....

So instead I tried:

$svn merge -rBASE:PREV kspread
svn: 'kspread' has no URL
(... why doesn't it use the url of the current directory as base? "svn info" shows the right url)

$ svn mkdir kspread
$ svn merge -rBASE:PREV kspread
svn: subversion/libsvn_ra_svn/marshal.c:421: vwrite_tuple: Assertion `opt || ((rev) >= 0)' failed.
^ bug?

I'm using svn version 1.2.0 (r14790).

-- 
David Faure, faure@kde.org, sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).
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