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This exception has no message.
java.lang.NullPointerException at org.java_websocket.SocketChannelIOHelper.read(SocketChannelIOHelper.java:12)[71:java_websocket:1.3.1.201512181726] at org.java_websocket.server.WebSocketServer.run(WebSocketServer.java:327)[71:java_websocket:1.3.1.201512181726] at java.lang.Thread.run(Thread.java:745)[:1.8.0_101]