Timeseries Java Client always returns 'null' for ingestion response/status

I'm using version 0.0.8 of the TimeSeries Java Client to ingest data.

The calls work fine (data is appearing in the Timeseries Instance), but the Java Client always returns an IngestionResponse with 'null' values. Looking through the decompiled source (in IntelliJ) it looks like it's returning a valid JSON response, but then throwing a (caught) NullPointerException because the Response isn't in the PendingIngestionsMap.

In ClientFactory.java

     private synchronized Set<MessageHandler> getMessageHandlers() {
         if(null == this.messageHandlers) {
             this.messageHandlers = new HashSet();
             this.messageHandlers.add(new Whole<String>() {
                 private Logger logger = LoggerFactory.getLogger(Whole.class);

                 public void onMessage(String message) {
                     this.logger.info("Received message: " + message);
                     IngestionResponse resp = (IngestionResponse)(new Gson()).fromJson(message, IngestionResponse.class);
                     IngestionResponse response = (IngestionResponse)PredixTimeseriesWebSocketIngestionClient.this.pendingIngestionsMap.get(resp.getMessageId());
                     response.setMessageId(resp.getMessageId());
                     response.setStatusCode(resp.getStatusCode());
                     response.getLatch().countDown();
                 }
             });
         }

         return this.messageHandlers;
     }

Is anyone else seeing this behaviour?

Cheers, Dan