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

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at org.kaazing.gateway.transport.wsn.WsCloseFilter$1.operationComplete(
at org.kaazing.gateway.transport.wsn.WsCloseFilter$1.operationComplete(
at org.kaazing.mina.core.future.DefaultIoFutureEx.notifyListener(
at org.kaazing.mina.core.future.DefaultIoFutureEx.notifyListeners(
at org.kaazing.mina.core.future.DefaultIoFutureEx.setValue(
at org.kaazing.mina.core.future.DefaultWriteFutureEx.setWritten(
at org.kaazing.mina.netty.ChannelWriteFutureListener.setFutureWritten(
at org.kaazing.mina.netty.ChannelWriteFutureListener.operationComplete(

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