#vulnerable code 
                             @Override
	public Mono<Void> fireAndForget(Payload payload) {
		GatewayExchange exchange = GatewayExchange.fromPayload(FIRE_AND_FORGET, payload);
		Tags tags = getTags(exchange);
		return findRSocketOrCreatePending(exchange)
				.flatMap(rSocket -> rSocket.fireAndForget(payload))
				.doOnError(t -> count("forward.request.fnf.error", tags))
				.doFinally(s -> count("forward.request.fnf", tags));
	} 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Override
	public Mono<Void> fireAndForget(Payload payload) {
		GatewayExchange exchange = createExchange(FIRE_AND_FORGET, payload);
		return findRSocketOrCreatePending(exchange)
				.flatMap(rSocket -> rSocket.fireAndForget(payload))
				.doOnError(t -> count(exchange, "error"))
				.doFinally(s -> count(exchange, ""));
	}