Rewriting to http:/// (no domain) when using Domain Source "Use active domain" option

When you set the option "Use active domain" on a node with Domain Source submodule, the request get a redirect (302) to an empty domain.

Ex:

1) You set "Use active domain" option as source domain in node id 123
2) You open the following URL in your browser http://subdomain.mydomain.com/node/123

Observed behavior:

You get a 302 redirection to http:///node/123

Expected behavior:

Stay on current domain so stay on http://subdomain.mydomain.com/node/123

The cause of the issue:

domain_source_domain_source_alter() in domain_source.domain.inc does a domain_lookup($source_id) with $source_id = -5 (DOMAIN_SOURCE_USE_ACTIVE constant value):

// The source_id always returns a valid domain.
$source = domain_lookup($source_id);

But domain_lookup returns -1 because it does:
if ((is_null($domain_id) && is_null($subdomain)) || ($domain_id < 0) {
$domains[$key] = -1;
}

While domain_source_domain_source_alter() expects it to return -5 in that case as after the domain_lookup it does:

// DOMAIN_SOURCE_USE_ACTIVE is the status for 'Use active domain.'
if ($source == DOMAIN_SOURCE_USE_ACTIVE) {
$source = domain_get_domain();
}