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

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java.lang.NullPointerException:
at org.kaazing.gateway.transport.wsn.WsCloseFilter$1.operationComplete(WsCloseFilter.java:187)
at org.kaazing.gateway.transport.wsn.WsCloseFilter$1.operationComplete(WsCloseFilter.java:169)
at org.kaazing.mina.core.future.DefaultIoFutureEx.notifyListener(DefaultIoFutureEx.java:423)
at org.kaazing.mina.core.future.DefaultIoFutureEx.notifyListeners(DefaultIoFutureEx.java:411)
at org.kaazing.mina.core.future.DefaultIoFutureEx.setValue(DefaultIoFutureEx.java:327)
at org.kaazing.mina.core.future.DefaultWriteFutureEx.setWritten(DefaultWriteFutureEx.java:89)
at org.kaazing.mina.netty.ChannelWriteFutureListener.setFutureWritten(ChannelWriteFutureListener.java:51)
at org.kaazing.mina.netty.ChannelWriteFutureListener.operationComplete(ChannelWriteFutureListener.java:41)

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