/**
  * {@inheritdoc}
  */
 public function findBy(array $criteria, array $orderBy = null, $limit = null, $offset = null)
 {
     try {
         return $this->unstableRepository->findBy($criteria, $orderBy, $limit, $offset);
     } catch (\Exception $exception) {
         return $this->fallbackRepository->findBy($criteria, $orderBy, $limit, $offset);
     }
 }