diff --git a/core/modules/migrate/src/Plugin/migrate/process/Extract.php b/core/modules/migrate/src/Plugin/migrate/process/Extract.php
index 4c31285..9fb68e3 100644
--- a/core/modules/migrate/src/Plugin/migrate/process/Extract.php
+++ b/core/modules/migrate/src/Plugin/migrate/process/Extract.php
@@ -33,7 +33,12 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
     }
     $new_value = NestedArray::getValue($value, $this->configuration['index'], $key_exists);
     if (!$key_exists) {
-      throw new MigrateException('Array index missing, extraction failed.');
+      if (isset($this->configuration['default'])) {
+        $new_value = $this->configuration['default'];
+      }
+      else {
+        throw new MigrateException('Array index missing, extraction failed.');
+      }
     }
     return $new_value;
   }
diff --git a/core/modules/migrate/tests/src/Unit/process/ExtractTest.php b/core/modules/migrate/tests/src/Unit/process/ExtractTest.php
index 6fbe4b8..650c6a1 100644
--- a/core/modules/migrate/tests/src/Unit/process/ExtractTest.php
+++ b/core/modules/migrate/tests/src/Unit/process/ExtractTest.php
@@ -51,4 +51,13 @@ public function testExtractFail() {
     $this->plugin->transform(array('bar' => 'foo'), $this->migrateExecutable, $this->row, 'destinationproperty');
   }
 
+  /**
+   * Tests unsuccessful extraction.
+   */
+  public function testExtractFailDefault() {
+    $plugin = new Extract(['index' => ['foo'], 'default' => 'test'], 'map', []);
+    $value = $plugin->transform(['bar' => 'foo'], $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($value, 'test', '');
+  }
+
 }
diff --git a/core/modules/migrate_drupal/config/optional/migrate.migration.d6_menu_links.yml b/core/modules/migrate_drupal/config/optional/migrate.migration.d6_menu_links.yml
index c98a3a7..9399aac 100644
--- a/core/modules/migrate_drupal/config/optional/migrate.migration.d6_menu_links.yml
+++ b/core/modules/migrate_drupal/config/optional/migrate.migration.d6_menu_links.yml
@@ -18,6 +18,7 @@ process:
       - 0
       - attributes
       - title
+    default: ''
   menu_name:
     plugin: migration
     migration: d6_menu
diff --git a/core/modules/migrate_drupal/src/Tests/Table/d6/MenuLinks.php b/core/modules/migrate_drupal/src/Tests/Table/d6/MenuLinks.php
index d6de491..6d4dfa4 100644
--- a/core/modules/migrate_drupal/src/Tests/Table/d6/MenuLinks.php
+++ b/core/modules/migrate_drupal/src/Tests/Table/d6/MenuLinks.php
@@ -5154,6 +5154,32 @@ public function load() {
       'p8' => '0',
       'p9' => '0',
       'updated' => '0',
+    ))->values(array(
+      'menu_name' => 'secondary-links',
+      'mlid' => '393',
+      'plid' => '0',
+      'link_path' => 'user/login',
+      'router_path' => 'user/login',
+      'link_title' => 'Test 3',
+      'options' => 'a:0:{}',
+      'module' => 'menu',
+      'hidden' => '0',
+      'external' => '0',
+      'has_children' => '1',
+      'expanded' => '0',
+      'weight' => '15',
+      'depth' => '1',
+      'customized' => '1',
+      'p1' => '138',
+      'p2' => '0',
+      'p3' => '0',
+      'p4' => '0',
+      'p5' => '0',
+      'p6' => '0',
+      'p7' => '0',
+      'p8' => '0',
+      'p9' => '0',
+      'updated' => '0',
     ))->execute();
   }
 
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateMenuLinkTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateMenuLinkTest.php
index aa5d964..631fc9c 100644
--- a/core/modules/migrate_drupal/src/Tests/d6/MigrateMenuLinkTest.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateMenuLinkTest.php
@@ -84,6 +84,17 @@ public function testMenuLinks() {
     $this->assertIdentical(['attributes' => ['title' => '']], $menu_link->link->options);
     $this->assertIdentical('https://www.drupal.org', $menu_link->link->uri);
     $this->assertIdentical(0, $menu_link->getWeight());
+
+    // assert that missing title attributes don't stop or break migration.
+    $menu_link = entity_load('menu_link_content', 393);
+    $this->assertIdentical('Test 3', $menu_link->getTitle());
+    $this->assertIdentical('secondary-links', $menu_link->getMenuName());
+    $this->assertIdentical('', $menu_link->getDescription());
+    $this->assertIdentical(TRUE, $menu_link->isEnabled());
+    $this->assertIdentical(FALSE, $menu_link->isExpanded());
+    $this->assertIdentical([], $menu_link->link->options);
+    $this->assertIdentical('internal:/user/login', $menu_link->link->uri);
+    $this->assertIdentical(15, $menu_link->getWeight());
   }
 
 }