Getting code error when people click on multsite activation link

When some one signs up for a multsite account they receive an activation email i.e. the sub-domain they chose and the activation key. Oddly when the activation email is clicked it goes back to to host site of the network and display the following error in the header area

"Warning: Creating default object from empty value in /home/*****/public_html/wp-includes/ms-settings.php on line 111"

The sub-domain is set up even with the error but this error keep showing up on every site activation link.

I have deactivate plugins that may affect it and still get the same result.

Please help! Thanks