Notice: Undefined property: stdClass::$nid in node_uri()

API page: https://api.drupal.org/api/drupal/modules!node!node.module/function/node...

Enter a descriptive title (above) relating to function node_uri, then describe the problem you have found:
Since updating to D7 - v7.35 - receiving the following error: Notice: Undefined property: stdClass::$nid in node_uri() (line 251 of /modules/node/node.module).

The code on line 251:

/**
 * Implements callback_entity_info_uri().
 */
function node_uri($node) {
  return array(
    'path' => 'node/' . $node->nid,

  );
}

This is confusing as callback_entity_info_uri() looks like this:

function callback_entity_info_uri($entity) {
  return array(
    'path' => 'node/' . $entity->nid,
  );
}

This error causes an issue when manipulating calendar views.
System particulars:
Drupal 7.35
PHP: 5.6.5
OS: CentOS 6.5
Views: 7.x-3.10