code: protected function findOneAddressBy($expression)
      {
          if (0 < $this->addresses->count()) {
              $criteria = Criteria::create()
                  ->where($expression)
                  ->setMaxResults(1);
  
              $matches = $this->addresses->matching($criteria);
              if ($matches->count() == 1) {
                  return $matches->first();
              }
          }
  
          return null;
      }
docs: Finds one address by expression.
  
  @param mixed $expression
  
  @return Model\CustomerAddressInterface|null