diff --git a/core/modules/migrate_drupal/tests/fixtures/drupal6.php b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
index 9334ac0142..2ecce6979e 100644
--- a/core/modules/migrate_drupal/tests/fixtures/drupal6.php
+++ b/core/modules/migrate_drupal/tests/fixtures/drupal6.php
@@ -46583,6 +46583,12 @@
   'dst' => 'the-zulu-people',
   'language' => 'en',
 ))
+->values(array(
+  'pid' => '8',
+  'src' => 'admin',
+  'dst' => 'noslash',
+  'language' => '',
+))
 ->execute();
 
 $connection->schema()->createTable('users', array(
diff --git a/core/modules/path/migrations/d6_url_alias.yml b/core/modules/path/migrations/d6_url_alias.yml
index fcf2036405..c5d793411e 100644
--- a/core/modules/path/migrations/d6_url_alias.yml
+++ b/core/modules/path/migrations/d6_url_alias.yml
@@ -27,6 +27,7 @@ process:
       delimiter: /
     -
       plugin: extract
+      default: 'INVALID_NID'
       index:
         - 1
     -
diff --git a/core/modules/path/tests/src/Kernel/Migrate/d6/MigrateUrlAliasTest.php b/core/modules/path/tests/src/Kernel/Migrate/d6/MigrateUrlAliasTest.php
index 092d5ac82d..2fb27a7b15 100644
--- a/core/modules/path/tests/src/Kernel/Migrate/d6/MigrateUrlAliasTest.php
+++ b/core/modules/path/tests/src/Kernel/Migrate/d6/MigrateUrlAliasTest.php
@@ -103,6 +103,14 @@ public function testUrlAlias() {
     ];
     $path = \Drupal::service('path.alias_storage')->load($conditions);
     $this->assertPath('3', $conditions, $path);
+
+    $path = \Drupal::service('path.alias_storage')->load(['alias' => '/noslash']);
+    $conditions = [
+      'source' => '/admin',
+      'alias' => '/noslash',
+      'langcode' => 'und',
+    ];
+    $this->assertPath('2', $conditions, $path);
   }
 
   /**