diff --git a/core/modules/node/src/Plugin/migrate/source/d6/Node.php b/core/modules/node/src/Plugin/migrate/source/d6/Node.php
index 7b4404f..c771146 100644
--- a/core/modules/node/src/Plugin/migrate/source/d6/Node.php
+++ b/core/modules/node/src/Plugin/migrate/source/d6/Node.php
@@ -271,6 +271,7 @@ protected function getFieldData(array $field, Row $node) {
     if (isset($query)) {
       $columns = array_keys($field['db_columns']);
       if (empty($columns)) {
+        // If the field db_columns is empty then there are no values to return.
         return [];
       }
 
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTest.php
index bffdc9b..9a7b7aa 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTest.php
@@ -39,13 +39,13 @@ public function providerSource() {
         'locked' => '0',
       ],
       [
-        'field_name' => 'field_test_node_referrer',
-        'type' => 'nodereferrer',
-        'global_settings' => 'a:6:{s:14:"referrer_types";a:10:{s:7:"article";i:0;s:7:"company";i:0;s:8:"employee";i:0;s:5:"forum";i:0;s:10:"test_event";i:0;s:9:"test_page";i:0;s:11:"test_planet";i:0;s:10:"test_story";i:0;s:7:"sponsor";i:0;s:5:"story";i:0;}s:15:"referrer_fields";a:1:{s:13:"field_company";i:0;}s:23:"referrer_nodes_per_page";s:1:"0";s:22:"referrer_pager_element";s:1:"0";s:14:"referrer_order";s:9:"TITLE_ASC";s:21:"referrer_translations";i:0;}',
+        'field_name' => 'field_test_empty_db_columns',
+        'type' => 'empty_db_columns',
+        'global_settings' => 'a:0:{}',
         'required' => '0',
         'multiple' => '0',
         'db_storage' => '1',
-        'module' => 'nodereferrer',
+        'module' => 'empty_db_columns',
         'db_columns' => 'a:0:{}',
         'active' => '1',
         'locked' => '0',
@@ -65,15 +65,15 @@ public function providerSource() {
         'widget_active' => '1',
       ],
       [
-        'field_name' => 'field_test_node_referrer',
+        'field_name' => 'field_test_empty_db_columns',
         'type_name' => 'story',
         'weight' => '33',
-        'label' => 'Node Referrer Field',
-        'widget_type' => 'nodereferrer_list',
+        'label' => 'Empty db_columns Field',
+        'widget_type' => 'empty_db_columns',
         'widget_settings' => 'a:0:{}',
-        'display_settings' => 'a:5:{s:5:"label";a:2:{s:6:"format";s:5:"above";s:7:"exclude";i:0;}i:5;a:2:{s:6:"format";s:7:"default";s:7:"exclude";i:0;}s:6:"teaser";a:2:{s:6:"format";s:7:"default";s:7:"exclude";i:0;}s:4:"full";a:2:{s:6:"format";s:7:"default";s:7:"exclude";i:0;}i:4;a:2:{s:6:"format";s:7:"default";s:7:"exclude";i:0;}}',
-        'description' => 'An example node referrer field.',
-        'widget_module' => 'nodereferrer',
+        'display_settings' => 'a:0:{}',
+        'description' => 'An example field with empty db_columns.',
+        'widget_module' => 'empty_db_columns',
         'widget_active' => '1',
       ],
     ];