Problem with post-commit and Corrupt filesystem

Hi,

everytime I give the executable permission bit to the post-commit
script, I can't commit anymore. This message appear when I commit:
«svn: Corrupt filesystem revision 55 in filesystem
'/usr/labri/cassou/svnroot/projet-programmation-3-lisp/db'».

Although, I receive a mail with this message :
/usr/share/doc/subversion-1.1.4/tools/hook-scripts/commit-email.pl:
`/usr/bin/svnlook diff
/usr/labri/cassou/svnroot/projet-programmation-3-lisp -r 55' failed
with this output: svn: Corrupt filesystem revision 55 in filesystem
'/usr/labri/cassou/svnroot/projet-programmation-3-lisp/db'

I can then use svnadmin verify to verify that the database is really
corrupted. svnadmin recover fixes the problem, but it reappears on the
next commit.

The content of post-commit is:

«
REPOS="$1"
REV="$2"

PATH=/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin
export PATH

/usr/share/doc/subversion-1.1.4/tools/hook-scripts/commit-email.pl
"$REPOS" "$REV" -h labri.fr -s '[PP3]' cassou@labri.fr
»

Is there anything I can do about this?

Thank you

-- 
Damien Cassou