CB

When calling setUserGetCBUserInstance with a guest user object it's ignored. The problem is you won't be able to use pre-parsed substitutions because it won't set the object. It instead just builds a new guest object. Allow setUserGetCBUserInstance to send an instance of $user and ignore the ->id check.

The workaround is as follows.

$cbUser = new CBuser();
$cbUser->_cbuser = $user;

Basically the last else case just needs to handle $user if preset and is an object instead of making a new one.