diff --git a/core/lib/Drupal/Component/Plugin/PluginManagerBase.php b/core/lib/Drupal/Component/Plugin/PluginManagerBase.php
index fce7004..883567f 100644
--- a/core/lib/Drupal/Component/Plugin/PluginManagerBase.php
+++ b/core/lib/Drupal/Component/Plugin/PluginManagerBase.php
@@ -76,10 +76,14 @@ public function createInstance($plugin_id, array $configuration = array()) {
   }
 
   /**
-   * Implements Drupal\Component\Plugin\PluginManagerInterface::getInstance().
+   * Implements \Drupal\Component\Plugin\Mapper\MapperInterface::getInstance().
    */
   public function getInstance(array $options) {
-    return $this->mapper->getInstance($options);
+    if (isset($this->mapper)) {
+      return $this->mapper->getInstance($options);
+    }
+
+    return FALSE;
   }
 
   /**