Debug message shows in $messages referencing view_handler_field_taxonomy

I'm getting the following status message in my theme related to a block view that shows child tax terms as an HTML jump list. The block is placed on system taxonomy pages. (taxonomy/term/tid) and uses the tid as a contextual filter to show all child terms related to that parent. The block is only placed on parent tax term pages.

Debug:

'Handler views_handler_field_taxonomy tried to add additional_field vocabulary_machine_name but taxonomy_vocabulary could not be added!'

in views_handler_field->add_additional_fields() (line 142 of /var/www/vhosts/MYDOMAIN/public/sites/all/modules/contrib/views/handlers/views_handler_field.inc).

Here is an export of my view.

$view = new view();
$view->name = 'sub_industry_listing';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'Sub-industry listing';
$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'] = 'Sub-industry listing';
$handler->display->display_options['use_more_always'] = FALSE;
$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['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'none';
$handler->display->display_options['style_plugin'] = 'jump_menu';
$handler->display->display_options['style_options']['path'] = 'tid';
$handler->display->display_options['style_options']['choose'] = '- Select a sub-industry -';
$handler->display->display_options['row_plugin'] = 'fields';
/* Relationship: Taxonomy Entity Index: Taxonomy terms on Node */
$handler->display->display_options['relationships']['taxonomy_entity_index_entity_tid']['id'] = 'taxonomy_entity_index_entity_tid';
$handler->display->display_options['relationships']['taxonomy_entity_index_entity_tid']['table'] = 'node';
$handler->display->display_options['relationships']['taxonomy_entity_index_entity_tid']['field'] = 'taxonomy_entity_index_entity_tid';
/* Field: Taxonomy term: Name */
$handler->display->display_options['fields']['name']['id'] = 'name';
$handler->display->display_options['fields']['name']['table'] = 'taxonomy_term_data';
$handler->display->display_options['fields']['name']['field'] = 'name';
$handler->display->display_options['fields']['name']['relationship'] = 'taxonomy_entity_index_entity_tid';
$handler->display->display_options['fields']['name']['label'] = '';
$handler->display->display_options['fields']['name']['element_label_colon'] = FALSE;
/* Field: Taxonomy term: Term ID */
$handler->display->display_options['fields']['tid']['id'] = 'tid';
$handler->display->display_options['fields']['tid']['table'] = 'taxonomy_term_data';
$handler->display->display_options['fields']['tid']['field'] = 'tid';
$handler->display->display_options['fields']['tid']['relationship'] = 'taxonomy_entity_index_entity_tid';
$handler->display->display_options['fields']['tid']['label'] = '';
$handler->display->display_options['fields']['tid']['exclude'] = TRUE;
$handler->display->display_options['fields']['tid']['alter']['alter_text'] = TRUE;
$handler->display->display_options['fields']['tid']['alter']['text'] = 'taxonomy/term/[tid]';
$handler->display->display_options['fields']['tid']['element_label_colon'] = FALSE;
/* Contextual filter: Taxonomy term: Parent term */
$handler->display->display_options['arguments']['parent']['id'] = 'parent';
$handler->display->display_options['arguments']['parent']['table'] = 'taxonomy_term_hierarchy';
$handler->display->display_options['arguments']['parent']['field'] = 'parent';
$handler->display->display_options['arguments']['parent']['relationship'] = 'taxonomy_entity_index_entity_tid';
$handler->display->display_options['arguments']['parent']['default_action'] = 'default';
$handler->display->display_options['arguments']['parent']['title_enable'] = TRUE;
$handler->display->display_options['arguments']['parent']['title'] = 'Associated %1 Industries';
$handler->display->display_options['arguments']['parent']['default_argument_type'] = 'taxonomy_tid';
$handler->display->display_options['arguments']['parent']['summary']['number_of_records'] = '0';
$handler->display->display_options['arguments']['parent']['summary']['format'] = 'default_summary';
$handler->display->display_options['arguments']['parent']['summary_options']['items_per_page'] = '25';
/* 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'] = 1;
$handler->display->display_options['filters']['status']['expose']['operator'] = FALSE;
/* Filter criterion: Content: Type */
$handler->display->display_options['filters']['type']['id'] = 'type';
$handler->display->display_options['filters']['type']['table'] = 'node';
$handler->display->display_options['filters']['type']['field'] = 'type';
$handler->display->display_options['filters']['type']['value'] = array(
  'brief' => 'brief',
);

/* Display: Block */
$handler = $view->new_display('block', 'Block', 'block');
$handler->display->display_options['defaults']['hide_admin_links'] = FALSE;
$handler->display->display_options['block_caching'] = '-1';

Not sure if this is a bug, or I have misconfigured my view (more likely). The view works exactly the way I want it to. Just need to get rid of this status message as it shows up for all users, including anonymous ones.