Password Tab passing string instead of array to drupal_goto()

I got this error when testing initial login as a new user after installing and configuring the module.

Recoverable fatal error: Argument 2 passed to drupal_goto() must be an array, string given, called in /var/www/drupal-7/sites/all/modules/password_policy/contrib/password_tab/password_policy_password_tab.module on line 71 and defined in drupal_goto() (line 668 of /var/www/drupal-7/includes/common.inc).

The call to drupal_goto is

// Change the drupal_goto to our change password tab.
        $path .= '/password';
        $query = isset($url_parts['query']) ? $url_parts['query'] : NULL;
        $fragment = isset($url_parts['fragment']) ? $url_parts['fragment'] : NULL;
        drupal_goto($path, $query, $fragment);

$query is evaluating to a string rather than an associative array.