diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
index 46aba47..3f2b142 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
@@ -153,7 +153,7 @@ public function getConstraints() {
     list($current_handler) = explode(':', $this->getSetting('handler'), 2);
     if ($current_handler === 'default') {
       $handler_settings = $this->getSetting('handler_settings');
-      if (!empty($handler_settings['target_bundles'])) {
+      if (isset($handler_settings['target_bundles'])) {
         $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
         $constraints[] = $constraint_manager->create('ComplexData', [
           'entity' => [