diff --git a/unique_field.module b/unique_field.module
index 3203547..bec08e6 100644
--- a/unique_field.module
+++ b/unique_field.module
@@ -145,21 +145,24 @@ function unique_field_form_node_type_form_builder($entity_type, NodeTypeInterfac
  */
 function unique_field_entity_bundle_field_info_alter(&$fields, \Drupal\Core\Entity\EntityTypeInterface $entity_type, $bundle) {
   if ($entity_type->id() == 'node') {
-    $node_type = \Drupal\node\Entity\NodeType::load($bundle);
-    $selected_fields = $node_type->getThirdPartySetting('unique_field', 'type_fields', '');
-    $field_scope = $node_type->getThirdPartySetting('unique_field', 'field_scope', '');
-    $field_comb = $node_type->getThirdPartySetting('unique_field', 'field_comb', '');
-    $show_match = $node_type->getThirdPartySetting('unique_field', 'show_match', '');
-    $options = array(
-      'bundle' => $bundle,
-      'fields' => $selected_fields,
-      'scope' => $field_scope,
-      'comb' => $field_comb,
-      'match' => $show_match,
-    );
-    foreach ($selected_fields as $key => $field) {
-      if(!empty($fields[$field])) {
-        $fields[$field]->addConstraint('UniqueField', $options);
+    if ($node_type = \Drupal\node\Entity\NodeType::load($bundle)) {
+      $selected_fields = $node_type->getThirdPartySetting('unique_field', 'type_fields', '');
+      $field_scope = $node_type->getThirdPartySetting('unique_field', 'field_scope', '');
+      $field_comb = $node_type->getThirdPartySetting('unique_field', 'field_comb', '');
+      $show_match = $node_type->getThirdPartySetting('unique_field', 'show_match', '');
+      $options = array(
+        'bundle' => $bundle,
+        'fields' => $selected_fields,
+        'scope' => $field_scope,
+        'comb' => $field_comb,
+        'match' => $show_match,
+      );
+      if (!empty($selected_fields)) {
+        foreach ($selected_fields as $key => $field) {
+          if(!empty($fields[$field])) {
+            $fields[$field]->addConstraint('UniqueField', $options);
+          }
+        }
       }
     }
   }