java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.eclipse.paho.client.mqttv3.internal.websocket.WebSocketHandshake.receiveHandshakeResponse(WebSocketHandshake.java:133)
at org.eclipse.paho.client.mqttv3.internal.websocket.WebSocketHandshake.execute(WebSocketHandshake.java:74)
at org.eclipse.paho.client.mqttv3.internal.websocket.WebSocketNetworkModule.start(WebSocketNetworkModule.java:78)
at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:650)

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