diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/ContentEntity.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/ContentEntity.php
index 607cc38..71b98af 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/ContentEntity.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/ContentEntity.php
@@ -142,13 +142,11 @@ protected function toArray(ContentEntityInterface $entity) {
     // This is necessary because the IDs must be flat. They cannot be nested for
     // the ID map.
     foreach (array_keys($this->getIds()) as $id) {
-      $reset = reset($return[$id]);
+      /** @var \Drupal\Core\TypedData\Plugin\DataType\ItemList $value */
+      $value = $entity->get($id);
       // Force the IDs over top the previous values.
       unset($return[$id]);
-      $return[$id] = reset($reset);
-      if (empty($return[$id])) {
-        throw new EntityMalformedException(sprintf('Entity of type %s and id %s is missing its id.', $entity->getEntityTypeId(), $entity->id()));
-      }
+      $return[$id] = $value->first()->getString();
     }
     return $return;
   }