Undefined index: path in domain_url_outbound_alter()

Hi there!

I have been using domain access for some time on a project of mine, and since the very beginning I am having this notice:

"Undefined index: path in domain_url_outbound_alter() (line 127 of ......./sites/all/modules/contrib/domain/settings_custom_url.inc)."

It has never caused any issue so I never really took time to understand it but I am currently trying to clean some stuff so I would like it to work properly. I have seen some people having the same issue but no solution :(

I unfortunately don't know how to reproduce it but I will try to give some context:
- When dpm() the $path_lookup, the current subdomain has very minimal information, (domain_id, subdomain, site_grant, sitename): missing the path.
- Only the main domain has all the domain info, including the path.

When backtracking notice with devel, I don't see any contrib module or custom code that could alter this.
I was able to remove the notice by loading the domain before altering the path:

if ($path_lookup[$name] != $_domain) {
    $options['absolute'] = TRUE;
    // In this case, the $base_url cannot have a trailing slash
    $domain_load = domain_load($path_lookup[$name]['domain_id']);
    $options['base_url'] = rtrim($domain_load['path'], '/');
    $target_domain_id = $path_lookup[$name]['domain_id'];
    // TODO: merge this code with the above for cleanup.
}

I know it is not the solution, but I am hoping it will get to the solution.
I will continue to investigate and update here if I find anything.

Thank you for your help,

Edouard