diff --git a/core/modules/field/src/Plugin/migrate/process/d6/FieldSettings.php b/core/modules/field/src/Plugin/migrate/process/d6/FieldSettings.php
index 01ef472..315a66c 100644
--- a/core/modules/field/src/Plugin/migrate/process/d6/FieldSettings.php
+++ b/core/modules/field/src/Plugin/migrate/process/d6/FieldSettings.php
@@ -44,6 +44,8 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
   public function getSettings($field_type, $global_settings) {
     $max_length = isset($global_settings['max_length']) ? $global_settings['max_length'] : '';
     $max_length = empty($max_length) ? 255 : $max_length;
+
+    $allowed_values = [];
     if (isset($global_settings['allowed_values'])) {
       $list = explode("\n", $global_settings['allowed_values']);
       $list = array_map('trim', $list);
@@ -62,9 +64,6 @@ public function getSettings($field_type, $global_settings) {
           $allowed_values = $list;
       }
     }
-    else {
-      $allowed_values = '';
-    }

     $settings = array(
       'text' => array(