Realname incorrectly displayed as 'Anonymous' in Views that get the uid from the URL and validate using User (realname)

Found this bug on a D6 site using Realname-6.x-1.5.

The view is displayed on '/user/someuser' pages and it is configured to get the uid based on the URL, convert it to the realname of the user, and display it as part of the title of the view. To convert the uid to the user's realname, the validator 'User (realname)' is provided by the class in realname_plugin_argument_validate_user.inc. In that class, the function validate_argument() sets $this->argument->validated_title to the return value of realname_make_name($account).

For whatever reason, the title always incorrectly displays 'Anonymous' as the user's realname. I managed to fix it with a simple patch but I haven't thoroughly tested it for regressions.