public function getDefaultOperations(EntityInterface $entity) {
$operations = parent::getDefaultOperations($entity);
- $operations['edit']['title'] = $this->t('Configure');
+ if (isset($operations['edit'])) {
+ $operations['edit']['title'] = $this->t('Configure');
+ }
// Add AJAX functionality to enable/disable operations.
foreach (array('enable', 'disable') as $op) {