Multi-domains plugin shows "DOMAIN_CURRENT_SITE" instead of my domain

I just installed and activated Multi-domains plugin and added 2 private domains. Both are showing up correctly.

But, the main domain is just showing as "DOMAIN_CURRENT_SITE". How can I change this to the actuall domain? as it doent look good at the registration page :slight_smile:

I tried to add this line, but then i just got another error + that it didnt change back to the domain:
define( 'DOMAIN_CURRENT_SITE', '');

Here is the error that shows:
Warning! Wildcard DNS for DOMAIN_CURRENT_SITE may not be configured correctly!

Unable to contact the random hostname (17fc88.DOMAIN_CURRENT_SITE).

PS, im not using GODADDY but im on a shared server. I got Wildcard DNS setup because i can controll my DNS setup.

Can anyone help me?