diff --git a/core/modules/locale/src/LocaleConfigManager.php b/core/modules/locale/src/LocaleConfigManager.php
index cab8816..f2f9d74 100644
--- a/core/modules/locale/src/LocaleConfigManager.php
+++ b/core/modules/locale/src/LocaleConfigManager.php
@@ -477,10 +477,15 @@ public function hasTranslation($name, $langcode) {
    *   configuration exists.
    */
   public function getDefaultConfigLangcode($name) {
-    $shipped = $this->defaultConfigStorage->read($name);
-    if (!empty($shipped)) {
-      return !empty($shipped['langcode']) ? $shipped['langcode'] : 'en';
+    // Config entities that do not have the 'default_config_hash' cannot be
+    // shipped configuration regardless of whether there is a name match.
+    if (!\Drupal::service('config.manager')->getEntityTypeIdByName($name) || !empty($this->configFactory->get($name)->get('default_config_hash'))) {
+      $shipped = $this->defaultConfigStorage->read($name);
+      if (!empty($shipped)) {
+        return !empty($shipped['langcode']) ? $shipped['langcode'] : 'en';
+      }
     }
+    return NULL;
   }
 
   /**
diff --git a/core/modules/locale/src/Tests/LocaleConfigManagerTest.php b/core/modules/locale/src/Tests/LocaleConfigManagerTest.php
index 39f14cb..93cfb7f 100644
--- a/core/modules/locale/src/Tests/LocaleConfigManagerTest.php
+++ b/core/modules/locale/src/Tests/LocaleConfigManagerTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\locale\Tests;
 
+use Drupal\block\Entity\Block;
 use Drupal\language\Entity\ConfigurableLanguage;
 use Drupal\simpletest\KernelTestBase;
 
@@ -22,7 +23,7 @@ class LocaleConfigManagerTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('language', 'locale', 'locale_test');
+  public static $modules = array('system', 'language', 'locale', 'locale_test', 'block');
 
   /**
    * Tests hasTranslation().
@@ -72,6 +73,37 @@ public function testGetDefaultConfigLangcode() {
     $this->assertNull(\Drupal::service('locale.config_manager')->getDefaultConfigLangcode('locale_test_translate.settings'), 'Before installing a module the locale config manager can not access the shipped configuration.');
     \Drupal::service('module_installer')->install(['locale_test_translate']);
     $this->assertEqual('en', \Drupal::service('locale.config_manager')->getDefaultConfigLangcode('locale_test_translate.settings'), 'After installing a module the locale config manager can get the shipped configuration langcode.');
+
+    $block = Block::create(array(
+      'id' => 'test_default_config',
+      'theme' => 'classy',
+      'status' => TRUE,
+      'region' => 'content',
+      'plugin' => 'local_tasks_block',
+      'settings' => [
+        'id' => 'local_tasks_block',
+        'label' => $this->randomMachineName(),
+        'provider' => 'core',
+        'label_display' => FALSE,
+        'primary' => TRUE,
+        'secondary' => TRUE,
+      ],
+    ));
+    $block->save();
+
+    // Install the theme after creating the block as installing the theme will
+    // install the block provided by the locale_test module.
+    \Drupal::service('theme_installer')->install(['classy']);
+
+    // The test_default_config block provided by the locale_test module will not
+    // be installed because a block with the same ID already exists.
+    $this->installConfig(['locale_test']);
+    $this->assertEqual(NULL, \Drupal::service('locale.config_manager')->getDefaultConfigLangcode('block.block.test_default_config'), 'The block.block.test_default_config is not shipped configuration.');
+    // Delete the block so we can install the one provided by the locale_test
+    // module.
+    $block->delete();
+    $this->installConfig(['locale_test']);
+    $this->assertEqual('en', \Drupal::service('locale.config_manager')->getDefaultConfigLangcode('block.block.test_default_config'), 'The block.block.test_default_config is shipped configuration.');
   }
 
 }
diff --git a/core/modules/locale/tests/modules/locale_test/config/optional/block.block.test_default_config.yml b/core/modules/locale/tests/modules/locale_test/config/optional/block.block.test_default_config.yml
new file mode 100644
index 0000000..15f0807
--- /dev/null
+++ b/core/modules/locale/tests/modules/locale_test/config/optional/block.block.test_default_config.yml
@@ -0,0 +1,19 @@
+langcode: en
+status: true
+dependencies:
+  theme:
+    - classy
+id: test_default_config
+theme: classy
+region: content
+weight: -40
+provider: null
+plugin: local_tasks_block
+settings:
+  id: local_tasks_block
+  label: Tabs
+  provider: core
+  label_display: '0'
+  primary: true
+  secondary: true
+visibility: {  }