Notice: Undefined property: view::$view in views_plugin_argument_default_user->get_argument()

I get the following notices together with the message "page not found"

• Notice: Undefined property: view::$view in views_plugin_argument_default_user->get_argument() (line 73 of /var/www/drupal-7/sites/all/modules/views/modules/user/views_plugin_argument_default_user.inc).
• Notice: Trying to get property of non-object in views_plugin_argument_default_user->get_argument() (line 73 of /var/www/drupal-7/sites/all/modules/views/modules/user/views_plugin_argument_default_user.inc).
• Notice: Trying to get property of non-object in views_plugin_argument_default_user->get_argument() (line 73 of /var/www/drupal-7/sites/all/modules/views/modules/user/views_plugin_argument_default_user.inc).

The view (page display) that results in these notices can be created in the following way:

• Contextual filters: (author) User: Uid
  • When the filter value is NOT in the URL: Provide default value
  • Type: User ID from URL
• Relationships: Content: Author
• Page settings: Path: /zzz

Point your browser to the path www.example.com/zzz without providing the filter value in the URL and you will see the messages (see also attached screenshot).

What follows is the exported view.

$view = new view;
$view->name = 'zzz';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'zzz';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['title'] = 'zzz';
$handler->display->display_options['access']['type'] = 'perm';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['query']['options']['query_comment'] = FALSE;
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['pager']['options']['items_per_page'] = '10';
$handler->display->display_options['style_plugin'] = 'default';
$handler->display->display_options['row_plugin'] = 'node';
/* Relationship: Content: Author */
$handler->display->display_options['relationships']['uid_1']['id'] = 'uid_1';
$handler->display->display_options['relationships']['uid_1']['table'] = 'node';
$handler->display->display_options['relationships']['uid_1']['field'] = 'uid';
$handler->display->display_options['relationships']['uid_1']['required'] = 0;
/* Field: Content: Title */
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'node';
$handler->display->display_options['fields']['title']['field'] = 'title';
$handler->display->display_options['fields']['title']['label'] = '';
$handler->display->display_options['fields']['title']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['title']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['title']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['title']['alter']['word_boundary'] = 0;
$handler->display->display_options['fields']['title']['alter']['ellipsis'] = 0;
$handler->display->display_options['fields']['title']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['title']['alter']['trim'] = 0;
$handler->display->display_options['fields']['title']['alter']['html'] = 0;
$handler->display->display_options['fields']['title']['hide_empty'] = 0;
$handler->display->display_options['fields']['title']['empty_zero'] = 0;
$handler->display->display_options['fields']['title']['link_to_node'] = 1;
/* Sort criterion: Content: Post date */
$handler->display->display_options['sorts']['created']['id'] = 'created';
$handler->display->display_options['sorts']['created']['table'] = 'node';
$handler->display->display_options['sorts']['created']['field'] = 'created';
$handler->display->display_options['sorts']['created']['order'] = 'DESC';
/* Contextual filter: User: Uid */
$handler->display->display_options['arguments']['uid']['id'] = 'uid';
$handler->display->display_options['arguments']['uid']['table'] = 'users';
$handler->display->display_options['arguments']['uid']['field'] = 'uid';
$handler->display->display_options['arguments']['uid']['relationship'] = 'uid_1';
$handler->display->display_options['arguments']['uid']['default_action'] = 'default';
$handler->display->display_options['arguments']['uid']['default_argument_type'] = 'user';
$handler->display->display_options['arguments']['uid']['default_argument_options']['user'] = FALSE;
$handler->display->display_options['arguments']['uid']['default_argument_skip_url'] = 0;
$handler->display->display_options['arguments']['uid']['summary']['number_of_records'] = '0';
$handler->display->display_options['arguments']['uid']['summary']['format'] = 'default_summary';
$handler->display->display_options['arguments']['uid']['summary_options']['items_per_page'] = '25';
$handler->display->display_options['arguments']['uid']['break_phrase'] = 0;
$handler->display->display_options['arguments']['uid']['not'] = 0;
/* Filter criterion: Content: Published */
$handler->display->display_options['filters']['status']['id'] = 'status';
$handler->display->display_options['filters']['status']['table'] = 'node';
$handler->display->display_options['filters']['status']['field'] = 'status';
$handler->display->display_options['filters']['status']['value'] = 1;
$handler->display->display_options['filters']['status']['group'] = 0;
$handler->display->display_options['filters']['status']['expose']['operator'] = FALSE;

/* Display: Page */
$handler = $view->new_display('page', 'Page', 'page');
$handler->display->display_options['path'] = 'zzz';