Apache logrotate fails on donkey

We get this ervey daily:

Cron <root@donkey> test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )

/etc/cron.daily/logrotate:
error: error creating output file /var/log/apache2/error.log.1.gz: File exists
error: error creating output file /var/log/apache2/other_vhosts_access.log.1.gz: File exists
run-parts: /etc/cron.daily/logrotate exited with return code 1