``` java.lang.IndexOutOfBoundsException: Index: 3,...
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java.lang.IndexOutOfBoundsException: Index: 3, Size: 3
	at java.util.ArrayList.rangeCheck(ArrayList.java:657)
	at java.util.ArrayList.get(ArrayList.java:433)
	at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:89)
	at com.sun.javafx.collections.VetoableListDecorator.get(VetoableListDecorator.java:306)
	at javafx.scene.Node.processCSS(Node.java:9051)
	at javafx.scene.Node.processCSS(Node.java:9051)
	at javafx.scene.Node.processCSS(Node.java:9051)
	at javafx.scene.Scene.doCSSPass(Scene.java:545)
	at javafx.scene.Scene.access$3600(Scene.java:159)
	at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2392)
	at com.sun.javafx.tk.Toolkit.lambda$runPulse$29(Toolkit.java:398)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:397)
	at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:424)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:518)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:498)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:491)
	at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$403(QuantumToolkit.java:319)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
	at java.lang.Thread.run(Thread.java:748)