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java.lang.NullPointerException: 	at net.hawkengine.ws.SessionPool.lambda$sendToUserSessions$0(SessionPool.java:73)	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174)	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)	at net.hawkengine.ws.SessionPool.sendToUserSessions(SessionPool.java:74)	at net.hawkengine.ws.WsEndpoint.onWebSocketConnect(WsEndpoint.java:100)	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onConnect(JettyListenerEventDriver.java:106)	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.openSession(AbstractEventDriver.java:229)	at org.eclipse.jetty.websocket.common.WebSocketSession.open(WebSocketSession.java:489)	at org.eclipse.jetty.websocket.common.WebSocketSession.onOpened(WebSocketSession.java:423)	at org.eclipse.jetty.io.AbstractConnection.onOpen(AbstractConnection.java:198)	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onOpen(AbstractWebSocketConnection.java:562)	at org.eclipse.jetty.io.AbstractEndPoint.upgrade(AbstractEndPoint.java:201)	at org.eclipse.jetty.server.HttpConnection.onCompleted(HttpConnection.java:369)	at org.eclipse.jetty.server.HttpChannel.onCompleted(HttpChannel.java:611)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:442)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)	at java.lang.Thread.run(Thread.java:745)