diff --git a/core/lib/Drupal/Core/Config/TypedConfigManager.php b/core/lib/Drupal/Core/Config/TypedConfigManager.php
index 647d00f..63f082b 100644
--- a/core/lib/Drupal/Core/Config/TypedConfigManager.php
+++ b/core/lib/Drupal/Core/Config/TypedConfigManager.php
@@ -12,6 +12,7 @@
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Component\Utility\String;
 use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Config\Schema\SchemaIncompleteException;
 
 /**
  * Manages config type plugins.
@@ -152,8 +153,10 @@ public function getDefinition($base_plugin_id) {
       $type = $name;
     }
     else {
-      // If we don't have definition, return the 'default' element.
-      // This should map to 'undefined' type by default, unless overridden.
+      if ($base_plugin_id != 'views.filter_value.language') {
+        // @todo this is temporary not really for commit.
+        throw new SchemaIncompleteException($base_plugin_id . " is missing schema.");
+      }
       $type = 'default';
     }
     $definition = $definitions[$type];
diff --git a/core/lib/Drupal/Core/Form/FormBase.php b/core/lib/Drupal/Core/Form/FormBase.php
index 0bfa753..5dedf6c 100644
--- a/core/lib/Drupal/Core/Form/FormBase.php
+++ b/core/lib/Drupal/Core/Form/FormBase.php
@@ -130,6 +130,13 @@ public function setConfigFactory(ConfigFactoryInterface $config_factory) {
   }
 
   /**
+   * Resets the configuration factory.
+   */
+  public function resetConfigFactory() {
+    $this->configFactory = NULL;
+  }
+
+  /**
    * Gets the request object.
    *
    * @return \Symfony\Component\HttpFoundation\Request $request
diff --git a/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php b/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
index 188dbbd..e22f5dc 100644
--- a/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
+++ b/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
@@ -254,6 +254,8 @@ public function submitForm(array &$form, array &$form_state) {
       // Add the site maintenance account's email address to the list of
       // addresses to be notified when updates are available, if selected.
       if ($form_state['values']['update_status_module'][2]) {
+        // Reset the configuration factory so it is updated with the new module.
+        $this->resetConfigFactory();
         $this->config('update.settings')->set('notification.emails', array($form_state['values']['account']['mail']))->save();
       }
     }