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java.lang.NullPointerException: 	at com.jcloisterzone.game.Game.undo(Game.java:186)	at com.jcloisterzone.ui.ClientMessageListener.handleUndo(ClientMessageListener.java:518)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at com.jcloisterzone.wsio.MessageDispatcher.dispatchOn(MessageDispatcher.java:36)	at com.jcloisterzone.wsio.MessageDispatcher.dispatch(MessageDispatcher.java:20)	at com.jcloisterzone.ui.ClientMessageListener.onWebsocketMessage(ClientMessageListener.java:143)	at com.jcloisterzone.wsio.WebSocketConnection$WebSocketClientImpl.onMessage(WebSocketConnection.java:100)	at org.java_websocket.client.WebSocketClient.onWebsocketMessage(WebSocketClient.java:248)	at org.java_websocket.WebSocketImpl.decodeFrames(WebSocketImpl.java:375)	at org.java_websocket.WebSocketImpl.decode(WebSocketImpl.java:158)	at org.java_websocket.client.WebSocketClient.run(WebSocketClient.java:185)	at java.lang.Thread.run(Thread.java:745)