Error note: Apache 2.2.3 + mod-auth-mysql

I recently struggled with libapache2-mod-auth-mysql in Debian Etch (I installed a backported version from http://www.zbla.net/debian). After (what I though) was proper configuration, it gave me the following error in the apache error log:

Internal error: pcfg_openfile() called with NULL filename

It seems that apache have problems when the auth_mysql is loaded after auth_basic. It worked when renaming auth_mysql.load to 000_auth_mysql.load. A similar thing has been reported about libapache2-mod-auth-pgsql in a Debian bug report.