Update to Drupal 8.2.2. For more information, see https://www.drupal.org/project/drupal/releases/8.2.2

core/modules/link/src/Plugin/migrate/cckfield/d7/LinkField.php

@@ -3,6 +3,7 @@
 namespace Drupal\link\Plugin\migrate\cckfield\d7;
 
 use Drupal\link\Plugin\migrate\cckfield\LinkField as D6LinkField;
+use Drupal\migrate\Plugin\MigrationInterface;
 
 /**
  * @MigrateCckField(
@@ -27,4 +28,21 @@ class LinkField extends D6LinkField {
     return ['link_field' => 'link_default'];
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function processFieldInstance(MigrationInterface $migration) {
+    $process = [
+      'plugin' => 'static_map',
+      'source' => 'instance_settings/title',
+      'bypass' => TRUE,
+      'map' => [
+        'disabled' => DRUPAL_DISABLED,
+        'optional' => DRUPAL_OPTIONAL,
+        'required' => DRUPAL_REQUIRED,
+      ],
+    ];
+    $migration->mergeProcessOfProperty('settings/title', $process);
+  }
+
 }