Property of non-object

Greetings,

I see that something similar to this issue has occurred in the past, but apparently not recently. On loading pages I am presented with the following error:

Notice: Trying to get property of non-object in nodeaccess_password_node_access_explain() (line 241 of /var/www/html/sites/all/modules/nodeaccess_password/nodeaccess_password.node.inc).

In looking at line 241, it appears, possibly, that the 'name' in the $account->name statement might be offending some sensibilities in my install:

 if (!empty($ops)) {
      $do = implode('/', $ops);
      if ($row->realm == 'nodeaccess_password_author') {
        $account = user_load($row->gid);
        return t(
          'Node author %name may !do this node',
          array(
  <strong>          '%name' => $account->name,</strong> (Line 241)
            '!do' => $do,

Does anyone know of some underlying something or other that would be responsible for this? I only had one issue that Drupal balked about in my PHP setup, which was that it wanted mbstring installed, so I did that, but still get the error message. Drupal is running on a Centos 6.x system.