diff --git a/core/lib/Drupal/Core/Theme/ThemeManager.php b/core/lib/Drupal/Core/Theme/ThemeManager.php
index 0cbd529..c10afa4 100644
--- a/core/lib/Drupal/Core/Theme/ThemeManager.php
+++ b/core/lib/Drupal/Core/Theme/ThemeManager.php
@@ -161,7 +161,7 @@ public function render($hook, array $variables) {
     $original_hook = $hook;
 
     // If there's no implementation, check for more generic fallbacks.
-    // If there's still no implementation, log an error and return an empty
+    // If there's still no implementation, trigger an error and return an empty
     // string.
     if (!$theme_registry->has($hook)) {
       // Iteratively strip everything after the last '__' delimiter, until an
@@ -173,10 +173,10 @@ public function render($hook, array $variables) {
         }
       }
       if (!$theme_registry->has($hook)) {
-        // Only log a message when not trying theme suggestions ($hook being an
-        // array).
+        // Only trigger an error when not trying theme suggestions ($hook being
+        // an array).
         if (!isset($candidate)) {
-          \Drupal::logger('theme')->warning('Theme hook %hook not found.', array('%hook' => $hook));
+          trigger_error(sprintf("Unknown theme hook '%s'.", $original_hook), E_USER_ERROR);
         }
         // There is no theme implementation for the hook passed. Return FALSE so
         // the function calling
@@ -321,6 +321,9 @@ public function render($hook, array $variables) {
         // has been written correctly and that the markup is safe.
         $output = Markup::create($info['function']($variables));
       }
+      else {
+        trigger_error(sprintf("Missing theme function '%s' for theme hook '%s'.", $info['function'], $hook), E_USER_ERROR);
+      }
     }
     else {
       $render_function = 'twig_render_template';
diff --git a/core/modules/node/src/Tests/NodeListBuilderTest.php b/core/modules/node/src/Tests/NodeListBuilderTest.php
index 2d23604..e4a0d35 100644
--- a/core/modules/node/src/Tests/NodeListBuilderTest.php
+++ b/core/modules/node/src/Tests/NodeListBuilderTest.php
@@ -20,7 +20,7 @@ class NodeListBuilderTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user'];
+  public static $modules = ['node', 'user', 'system'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/shortcut/shortcut.module b/core/modules/shortcut/shortcut.module
index 066afcc..01cede5 100644
--- a/core/modules/shortcut/shortcut.module
+++ b/core/modules/shortcut/shortcut.module
@@ -438,3 +438,12 @@ function shortcut_themes_installed($theme_list) {
     }
   }
 }
+
+/**
+ * Implements hook_entity_type_alter().
+ */
+function shortcut_entity_type1_alter(&$entity_types) {
+  // Unset view builder for Shortcut entity which is set by default in
+  // Drupal\Core\Entity\ContentEntityBase.
+  $entity_types['shortcut']->setViewBuilderClass(NULL);
+}