diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 3b156a5..56e1ae4 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1274,7 +1274,8 @@ function template_preprocess_html(&$variables) {
   }
   else {
     $system_path = \Drupal::service('path.current')->getPath();
-    $variables['root_path'] = explode('/', $system_path)[1];
+    debug($system_path);
+    $variables['root_path'] = $system_path === '/' ? '' : explode('/', $system_path)[1];
   }
 
   $site_config = \Drupal::config('system.site');
diff --git a/core/lib/Drupal/Core/Menu/MenuTreeStorage.php b/core/lib/Drupal/Core/Menu/MenuTreeStorage.php
index 7f2dc0c..ac63e9b 100644
--- a/core/lib/Drupal/Core/Menu/MenuTreeStorage.php
+++ b/core/lib/Drupal/Core/Menu/MenuTreeStorage.php
@@ -633,10 +633,10 @@ protected function prepareLink(array $link, $intersect = FALSE) {
         $link[$name] = unserialize($link[$name]);
       }
     }
-    if (isset($link['title_serialized'])) {
+    if (array_key_exists('title_serialized', $link)) {
       $link['title'] = $link['title_serialized'];
     }
-    if (isset($link['description_serialized'])) {
+    if (array_key_exists('description_serialized', $link)) {
       $link['description'] = $link['description_serialized'];
     }
 
diff --git a/core/modules/system/src/Tests/Update/UpdatePathTestBaseTest.php b/core/modules/system/src/Tests/Update/UpdatePathTestBaseTest.php
index 305ab78..40430fc 100644
--- a/core/modules/system/src/Tests/Update/UpdatePathTestBaseTest.php
+++ b/core/modules/system/src/Tests/Update/UpdatePathTestBaseTest.php
@@ -37,6 +37,8 @@ public function testDatabaseLoaded() {
       $this->assertEqual(drupal_get_installed_schema_version($module), 8000, SafeMarkup::format('Module @module schema is 8000', ['@module' => $module]));
     }
     $this->assertEqual(\Drupal::config('system.site')->get('name'), 'Site-Install');
+
+    $this->runUpdates();
     $this->drupalGet('<front>');
     $this->assertText('Site-Install');
   }