portsnap database corrupted

Today I noticed a problem on one of my FreeBSD machines. After running /usr/sbin/portsnap I got an error telling that one file didn't exist. After playing a little bit around to get the error fixed I simply cleared the portsnap directory and now it is working again:

cd /var/db/portsnap
rm -rf *
portsnap fetch && portsnap update

Easier then expected :).