Drupal dblog throws an error if the request logged had a malformed referrer URI

If a request to non-existent path contains a malformed referrer (e.g. "art.nouveau.world" with no protocol specified), you can see the 404 log entry in the dblog but when you click on it to drill down to the details you get an error:

The website encountered an unexpected error. Please try again later.
InvalidArgumentException: The URI 'art.nouveau.world' is invalid. You must use a valid URI scheme. in Drupal\Core\Url::fromUri() (line 281 of core/lib/Drupal/Core/Url.php).

IMHO the logger code should not assume that REFERRER field always contains a valid URL - it can contain any garbage if it comes from a malicious/sloppily written bot/spider.