diff --git a/core/lib/Drupal/Core/Entity/Field/FieldTypePluginManager.php b/core/lib/Drupal/Core/Entity/Field/FieldTypePluginManager.php
index e2b254d..ec5f187 100644
--- a/core/lib/Drupal/Core/Entity/Field/FieldTypePluginManager.php
+++ b/core/lib/Drupal/Core/Entity/Field/FieldTypePluginManager.php
@@ -33,7 +33,7 @@ class FieldTypePluginManager extends DefaultPluginManager {
    *
    * @var array
    */
-  protected $fieldTypeOptions;
+  protected $fieldTypeOptions = array();
 
   /**
    * Constructs the FieldTypePluginManager object
@@ -89,6 +89,14 @@ public function getDefaultInstanceSettings($type) {
   }
 
   /**
+   * {@inheritdoc}
+   */
+  public function clearCachedDefinitions() {
+    $this->fieldTypeOptions = array();
+    parent::clearCachedDefinitions();
+  }
+
+  /**
    * Returns an array of field type options.
    *
    * @param string|null $type