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java.lang.IllegalArgumentException: 	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:108)	at com.dmdirc.ui.WindowManager.removeWindow(WindowManager.java:264)	at com.dmdirc.ui.WindowManager.frameClosing(WindowManager.java:420)	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:498)	at net.engio.mbassy.dispatch.ReflectiveHandlerInvocation.invoke(ReflectiveHandlerInvocation.java:29)	at net.engio.mbassy.dispatch.MessageDispatcher.dispatch(MessageDispatcher.java:30)	at net.engio.mbassy.dispatch.FilteredMessageDispatcher.dispatch(FilteredMessageDispatcher.java:42)	at net.engio.mbassy.subscription.Subscription.publish(Subscription.java:72)	at net.engio.mbassy.bus.MessagePublication.execute(MessagePublication.java:49)	at net.engio.mbassy.bus.MBassador.publish(MBassador.java:66)	at com.dmdirc.DMDircMBassador.publish(DMDircMBassador.java:74)	at com.dmdirc.FrameContainer.close(FrameContainer.java:212)	at com.dmdirc.ServerManager.closeAll(ServerManager.java:156)	at com.dmdirc.addons.ui_swing.QuitWorker.doInBackground(QuitWorker.java:75)	at com.dmdirc.addons.ui_swing.QuitWorker.doInBackground(QuitWorker.java:38)	at javax.swing.SwingWorker$1.call(SwingWorker.java:295)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at javax.swing.SwingWorker.run(SwingWorker.java:334)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)