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

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java.lang.NullPointerException:
at org.java_websocket.SocketChannelIOHelper.read(SocketChannelIOHelper.java:12)
at org.java_websocket.server.WebSocketServer.run(WebSocketServer.java:327)
at java.lang.Thread.run(Thread.java:745)

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