Error: Missing or invalid Apache user

Hi,

in my virtual-host templates I do have enabled:

"Add Apache user to Unix group for new servers", setting is: "Yes, find Apache user automatically"

The user won't be added to the group for new domain owners.
I've changed the setting to "Yes, Apache user is www-data"
and then the template cannot be saved with the error:

"Error: Missing or invalid Apache user"

but the apache user is www-data:

www-data 14717 13273 0 12:53 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 14718 13273 0 12:53 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 14720 13273 0 12:53 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 14721 13273 0 12:53 ? 00:00:00 /usr/sbin/apache2 -k start

ciao, Marc