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java.util.ConcurrentModificationException: 	at java.util.ArrayList.removeIf(ArrayList.java:1411)	at simulizer.ui.components.Workspace.closeAll(Workspace.java:150)	at simulizer.ui.WindowManager.shutdown(WindowManager.java:387)	at simulizer.ui.WindowManager.lambda$new$0(WindowManager.java:90)	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)	at javafx.event.Event.fireEvent(Event.java:198)	at com.sun.javafx.stage.WindowPeerListener.closing(WindowPeerListener.java:88)	at com.sun.javafx.tk.quantum.GlassWindowEventHandler.run(GlassWindowEventHandler.java:121)	at com.sun.javafx.tk.quantum.GlassWindowEventHandler.run(GlassWindowEventHandler.java:40)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.tk.quantum.GlassWindowEventHandler.lambda$handleWindowEvent$275(GlassWindowEventHandler.java:150)	at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)	at com.sun.javafx.tk.quantum.GlassWindowEventHandler.handleWindowEvent(GlassWindowEventHandler.java:148)	at com.sun.glass.ui.Window.handleWindowEvent(Window.java:1266)	at com.sun.glass.ui.Window.notifyClose(Window.java:1174)	at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)	at com.sun.glass.ui.gtk.GtkApplication.lambda$null$450(GtkApplication.java:139)	at java.lang.Thread.run(Thread.java:745)