#fixed code
                             @SuppressWarnings("unchecked")
	private Lease renew(Lease lease) {

		return operations.doWithSession(restOperations -> leaseEndpoints.renew(lease,
				restOperations));
	}
#vulnerable code 
                             @SuppressWarnings("unchecked")
	private Lease renew(Lease lease) {

		HttpEntity<Object> leaseRenewalEntity = getLeaseRenewalBody(lease);

		ResponseEntity<Map<String, Object>> entity = operations
				.doWithSession(restOperations -> (ResponseEntity) restOperations
						.exchange("sys/renew", HttpMethod.PUT, leaseRenewalEntity, Map.class));

		Assert.state(entity != null && entity.getBody() != null,
				"Renew response must not be null");

		Map<String, Object> body = entity.getBody();
		String leaseId = (String) body.get("lease_id");
		Number leaseDuration = (Number) body.get("lease_duration");
		boolean renewable = (Boolean) body.get("renewable");

		return Lease.of(leaseId, leaseDuration != null ? leaseDuration.longValue() : 0,
				renewable);
	} 
                            #location 14 
                            #vulnerability type NULL_DEREFERENCE