Recoverable fatal error: Argument 2 passed to drupal_goto() must be an array

A site we're developing has recently been displaying a very generic error when attempting to access a page that's known not to exist (e.g. www.exampledomain.com/domain/dhfhfjfjf). Here "domain" is a content type.

"The website encountered an unexpected error. Please try again later.

Error message
Recoverable fatal error: Argument 2 passed to drupal_goto() must be an array, string given in drupal_goto() (line 686 of /path/includes/common.inc).
Error with drupal_goto() used as page callback in hook_menu()"

The issue seems to be stemming from the drupal_goto() in a hook_menu() call. I expect non-existent pages to return 404 errors.

The problem seems to be located inside /sites/all/modules/domain/domain_nav/domain_nav.module

If we comment out domain_nav_menu function, then our theme works just fine.

What's interesting about the error is that hook_menu() here is not passing two arguments.

It looks like the module is returning an unexpected result when you pass a bad value as the second argument in the URL.

Anyone know what may be happening and what can be done?

Thanks,

pressing