diff --git a/core/lib/Drupal/Core/Field/FormatterPluginManager.php b/core/lib/Drupal/Core/Field/FormatterPluginManager.php
index c30ab0e..8c2a959 100644
--- a/core/lib/Drupal/Core/Field/FormatterPluginManager.php
+++ b/core/lib/Drupal/Core/Field/FormatterPluginManager.php
@@ -95,8 +95,8 @@ public function createInstance($plugin_id, array $configuration) {
    *     - settings: (array) Settings specific to the formatter. Each setting
    *       defaults to the default value specified in the formatter definition.
    *
-   * @return \Drupal\Core\Field\FormatterInterface
-   *   A formatter object.
+   * @return \Drupal\Core\Field\FormatterInterface|null
+   *   A formatter object or NULL when plugin is not found.
    */
   public function getInstance(array $options) {
     $configuration = $options['configuration'];
@@ -117,6 +117,9 @@ public function getInstance(array $options) {
     if (!isset($definition['class']) || !in_array($field_type, $definition['field_types'])) {
       // Grab the default widget for the field type.
       $field_type_definition = $this->fieldTypeManager->getDefinition($field_type);
+      if (empty($field_type_definition['default_formatter'])) {
+        return NULL;
+      }
       $plugin_id = $field_type_definition['default_formatter'];
     }
 
diff --git a/core/lib/Drupal/Core/Field/WidgetPluginManager.php b/core/lib/Drupal/Core/Field/WidgetPluginManager.php
index 5ca455a..10ec063 100644
--- a/core/lib/Drupal/Core/Field/WidgetPluginManager.php
+++ b/core/lib/Drupal/Core/Field/WidgetPluginManager.php
@@ -75,8 +75,8 @@ public function __construct(\Traversable $namespaces, CacheBackendInterface $cac
    *     - settings: (array) Settings specific to the widget. Each setting
    *       defaults to the default value specified in the widget definition.
    *
-   * @return \Drupal\Core\Field\WidgetInterface
-   *   A Widget object.
+   * @return \Drupal\Core\Field\WidgetInterface|null
+   *   A Widget object or NULL when plugin is not found.
    */
   public function getInstance(array $options) {
     // Fill in defaults for missing properties.
@@ -103,6 +103,9 @@ public function getInstance(array $options) {
     if (!isset($definition['class']) || !in_array($field_type, $definition['field_types'])) {
       // Grab the default widget for the field type.
       $field_type_definition = $this->fieldTypeManager->getDefinition($field_type);
+      if (empty($field_type_definition['default_widget'])) {
+        return NULL;
+      }
       $plugin_id = $field_type_definition['default_widget'];
     }
 
diff --git a/core/modules/field_ui/lib/Drupal/field_ui/DisplayOverview.php b/core/modules/field_ui/lib/Drupal/field_ui/DisplayOverview.php
index a7e3c5c..d391047 100644
--- a/core/modules/field_ui/lib/Drupal/field_ui/DisplayOverview.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/DisplayOverview.php
@@ -136,7 +136,7 @@ protected function getPluginOptions($field_type) {
    * {@inheritdoc}
    */
   protected function getDefaultPlugin($field_type) {
-    return $this->fieldTypes[$field_type]['default_formatter'];
+    return isset($this->fieldTypes[$field_type]['default_formatter']) ? $this->fieldTypes[$field_type]['default_formatter'] : NULL;
   }
 
   /**
diff --git a/core/modules/field_ui/lib/Drupal/field_ui/FormDisplayOverview.php b/core/modules/field_ui/lib/Drupal/field_ui/FormDisplayOverview.php
index 0f05907..aba308c 100644
--- a/core/modules/field_ui/lib/Drupal/field_ui/FormDisplayOverview.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/FormDisplayOverview.php
@@ -103,7 +103,7 @@ protected function getPluginOptions($field_type) {
    * {@inheritdoc}
    */
   protected function getDefaultPlugin($field_type) {
-    return $this->fieldTypes[$field_type]['default_widget'];
+    return isset($this->fieldTypes[$field_type]['default_widget']) ? $this->fieldTypes[$field_type]['default_widget'] : NULL;
   }
 
   /**