output: #fixed code
                                  Orderer(String name, String url, Properties properties) throws InvalidArgumentException {
  
          if (StringUtil.isNullOrEmpty(name)) {
              throw new InvalidArgumentException("Invalid name for orderer");
          }
          Exception e = checkGrpcUrl(url);
          if (e != null) {
              throw new InvalidArgumentException(e);
          }
  
          this.name = name;
          this.url = url;
          this.properties = properties == null ? null : (Properties) properties.clone(); //keep our own copy.
  
      }
input: #vulnerable code 
                                  DeliverResponse[] sendDeliver(Common.Envelope transaction) throws TransactionException {
  
          if (shutdown) {
              throw new TransactionException(format("Orderer %s was shutdown.", name));
          }
  
          OrdererClient localOrdererClient = ordererClient;
  
          logger.debug(format("Order.sendDeliver name: %s, url: %s", name, url));
          if (localOrdererClient == null || !localOrdererClient.isChannelActive()) {
              localOrdererClient = new OrdererClient(this, new Endpoint(url, properties).getChannelBuilder());
              ordererClient = localOrdererClient;
          }
  
          try {
  
              return localOrdererClient.sendDeliver(transaction);
          } catch (Throwable t) {
              ordererClient = null;
              throw t;
  
          }
  
      } 
                              #location 17 
                              #vulnerability type NULL_DEREFERENCE