output: #fixed code
                                  public void executeSendMessageHookBefore(final ChannelHandlerContext ctx, final RemotingCommand request,
                                               SendMessageContext context) {
          if (hasSendMessageHook()) {
              for (SendMessageHook hook : this.sendMessageHookList) {
                  try {
                      final SendMessageRequestHeader requestHeader = parseRequestHeader(request);
  
                      if (null != requestHeader) {
                          context.setProducerGroup(requestHeader.getProducerGroup());
                          context.setTopic(requestHeader.getTopic());
                          context.setBodyLength(request.getBody().length);
                          context.setMsgProps(requestHeader.getProperties());
                          context.setBornHost(RemotingHelper.parseChannelRemoteAddr(ctx.channel()));
                          context.setBrokerAddr(this.brokerController.getBrokerAddr());
                          context.setQueueId(requestHeader.getQueueId());
                      }
  
                      hook.sendMessageBefore(context);
                      if (requestHeader != null) {
                          requestHeader.setProperties(context.getMsgProps());
                      }
                  } catch (Throwable e) {
                      // Ignore
                  }
              }
          }
      }
input: #vulnerable code 
                                  public void executeSendMessageHookBefore(final ChannelHandlerContext ctx, final RemotingCommand request,
                                               SendMessageContext context) {
          if (hasSendMessageHook()) {
              for (SendMessageHook hook : this.sendMessageHookList) {
                  try {
                      final SendMessageRequestHeader requestHeader = parseRequestHeader(request);
  
                      if (null != requestHeader) {
                          context.setProducerGroup(requestHeader.getProducerGroup());
                          context.setTopic(requestHeader.getTopic());
                          context.setBodyLength(request.getBody().length);
                          context.setMsgProps(requestHeader.getProperties());
                          context.setBornHost(RemotingHelper.parseChannelRemoteAddr(ctx.channel()));
                          context.setBrokerAddr(this.brokerController.getBrokerAddr());
                          context.setQueueId(requestHeader.getQueueId());
                      }
  
                      hook.sendMessageBefore(context);
                      requestHeader.setProperties(context.getMsgProps());
                  } catch (Throwable e) {
                  }
              }
          }
      } 
                              #location 19 
                              #vulnerability type NULL_DEREFERENCE