diff --git a/core/lib/Drupal/Core/Menu/LocalTaskManager.php b/core/lib/Drupal/Core/Menu/LocalTaskManager.php
index f71f2f4..7b19e64 100644
--- a/core/lib/Drupal/Core/Menu/LocalTaskManager.php
+++ b/core/lib/Drupal/Core/Menu/LocalTaskManager.php
@@ -190,7 +190,7 @@ protected function addMissingDefaultTab($base_route_name) {
     $definitions = array();
     try {
       $route = $this->routeProvider->getRouteByName($base_route_name);
-      $title = $route->attributes->get('_title');
+      $title = $route->getDefault('_title');
       $plugin_id = 'default_local_task:' . $base_route_name;
       $definitions[$plugin_id] = array(
         'route_name' => $base_route_name,
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
index 7c8986d..b3ce479 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
@@ -12,6 +12,8 @@
 use Drupal\Tests\UnitTestCase;
 use Symfony\Component\HttpFoundation\ParameterBag;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\Exception\RouteNotFoundException;
+use Symfony\Component\Routing\Route;
 use Zend\Stdlib\ArrayObject;
 
 /**
@@ -101,11 +103,6 @@ protected function setUp() {
     $this->controllerResolver = $this->getMock('Symfony\Component\HttpKernel\Controller\ControllerResolverInterface');
     $this->request = new Request();
     $this->routeProvider = $this->getMock('Drupal\Core\Routing\RouteProviderInterface');
-    $fake_route = new \stdClass;
-    $fake_route->attributes = new ParameterBag();
-    $this->routeProvider->expects($this->any())
-      ->method('getRouteByName')
-      ->will($this->returnValue($fake_route));
     $this->pluginDiscovery = $this->getMock('Drupal\Component\Plugin\Discovery\DiscoveryInterface');
     $this->factory = $this->getMock('Drupal\Component\Plugin\Factory\FactoryInterface');
     $this->cacheBackend = $this->getMock('Drupal\Core\Cache\CacheBackendInterface');
@@ -217,6 +214,7 @@ public function testGetLocalTaskForRouteWithFilledCache() {
    * Tests findDefinitions and ensure that default tabs are added automatically.
    *
    * @see \Drupal\Core\Menu\LocalTaskManager::findDefinitions()
+   * @see \Drupal\Core\Menu\LocalTaskManager::addMisingDefaultTab()
    */
   public function testFindDefinitions() {
     $definitions = $this->getLocalTasksFixture2();
@@ -231,12 +229,48 @@ public function testFindDefinitions() {
 
     $this->setupLocalTaskManager();
 
+    $route = new Route('/route-4', array('_title' => 'example'));
+    $this->routeProvider->expects($this->any())
+      ->method('getRouteByName')
+      ->with($this->equalTo('route_4'))
+      ->will($this->returnValue($route));
+
     $local_tasks = $this->manager->getDefinitions();
 
     $this->assertNotEmpty($local_tasks['default_local_task:route_4']);
     $local_task = $local_tasks['default_local_task:route_4'];
     $this->assertEquals('route_4', $local_task['route_name']);
     $this->assertEquals('route_4', $local_task['base_route_name']);
+    $this->assertEquals('example', $local_task['title']);
+  }
+
+  /**
+   * Tests findDefinitions with default tab with wrong specific route name.
+   *
+   * @see \Drupal\Core\Menu\LocalTaskManager::findDefinitions()
+   * @see \Drupal\Core\Menu\LocalTaskManager::addMisingDefaultTab()
+   */
+  public function testFindDefinitionsWithInvalidBaseRouteName() {
+    $definitions = $this->getLocalTasksFixture2();
+    $this->pluginDiscovery->expects($this->once())
+      ->method('getDefinitions')
+      ->will($this->returnValue($definitions));
+
+    // Ensure that the alter hook is called.
+    $this->moduleHandler->expects($this->once())
+      ->method('alter')
+      ->with($this->equalTo('local_tasks'));
+
+    $this->setupLocalTaskManager();
+
+    $this->routeProvider->expects($this->any())
+      ->method('getRouteByName')
+      ->with($this->equalTo('route_4'))
+      ->will($this->throwException(new RouteNotFoundException()));
+
+    $local_tasks = $this->manager->getDefinitions();
+
+    $this->assertTrue(empty($local_tasks['default_local_task:route_4']));
   }
 
   /**
@@ -244,6 +278,7 @@ public function testFindDefinitions() {
    *
    * @see \Drupal\Core\Menu\LocalTaskManager::findDefinitions()
    * @see \Drupal\Core\Menu\LocalTaskManager::getDefinition()
+   * @see \Drupal\Core\Menu\LocalTaskManager::addMisingDefaultTab()
    */
   public function testFindDefinitionsWithSingleDefinition() {
     $definitions = $this->getLocalTasksFixture2();
@@ -253,6 +288,12 @@ public function testFindDefinitionsWithSingleDefinition() {
 
     $this->setupLocalTaskManager();
 
+    $route = new Route('/route-4', array('_title' => 'example'));
+    $this->routeProvider->expects($this->any())
+      ->method('getRouteByName')
+      ->with($this->equalTo('route_4'))
+      ->will($this->returnValue($route));
+
     $local_task = $this->manager->getDefinition('default_local_task:route_4');
     $this->assertNotEmpty($local_task);
     $this->assertEquals('route_4', $local_task['route_name']);