#fixed code
                                public GetTransferResponse getTransfers(String seed, Integer start, Integer end, Boolean inclusionStates) throws ArgumentException, InvalidBundleException, InvalidSignatureException {
        // validate & if needed pad seed
        if ( (seed = InputValidator.validateSeed(seed)) == null) {
            throw new IllegalStateException("Invalid Seed");
        }

        start = start != null ? 0 : start;
        end = end == null ? null : end;
        inclusionStates = inclusionStates != null ? inclusionStates : null;

        if (start > end || end > (start + 500)) {
            throw new ArgumentException();
        }
        StopWatch sw = new StopWatch();
        sw.start();
        System.out.println("GetTransfer started");
        GetNewAddressResponse gnr = getNewAddress(seed, start, false, end == null ? end - start : end, true);
        if (gnr != null && gnr.getAddresses() != null) {
            System.out.println("GetTransfers after getNewAddresses " + sw.getTime() + " ms");
            Bundle[] bundles = bundlesFromAddresses(gnr.getAddresses().toArray(new String[gnr.getAddresses().size()]), inclusionStates);
            System.out.println("GetTransfers after bundlesFromAddresses " + sw.getTime() + " ms");
            sw.stop();

            return GetTransferResponse.create(bundles);
        }
        sw.stop();
        return null;
    }
#vulnerable code 
                                public GetTransferResponse getTransfers(String seed, Integer start, Integer end, Boolean inclusionStates) throws ArgumentException, InvalidBundleException, InvalidSignatureException {
        start = start != null ? 0 : start;
        end = end == null ? null : end;
        inclusionStates = inclusionStates != null ? inclusionStates : null;

        if (start > end || end > (start + 500)) {
            throw new ArgumentException();
        }

        GetNewAddressResponse gnr = getNewAddress(seed, start, false, end == null ? end - start : end, true);
        if (gnr != null && gnr.getAddresses() != null) {
            Bundle[] bundles = bundlesFromAddresses(gnr.getAddresses().toArray(new String[gnr.getAddresses().size()]), inclusionStates);
            return GetTransferResponse.create(bundles);
        }
        return null;
    } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE