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java.lang.NullPointerException: 	at main.Controller$ColoredCell.updateItem(Controller.java:88)	at main.Controller$ColoredCell.updateItem(Controller.java:83)	at javafx.scene.control.ListCell.updateItem(ListCell.java:480)	at javafx.scene.control.ListCell.access$300(ListCell.java:72)	at javafx.scene.control.ListCell$4.invalidated(ListCell.java:299)	at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111)	at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)	at javafx.scene.control.ListCell.setListView(ListCell.java:305)	at javafx.scene.control.ListCell.updateListView(ListCell.java:494)	at com.sun.javafx.scene.control.skin.ListViewSkin.createCell(ListViewSkin.java:292)	at com.sun.javafx.scene.control.skin.ListViewSkin.lambda$new$366(ListViewSkin.java:99)	at com.sun.javafx.scene.control.skin.VirtualFlow.getCell(VirtualFlow.java:1777)	at com.sun.javafx.scene.control.skin.VirtualFlow.getCellLength(VirtualFlow.java:1879)	at com.sun.javafx.scene.control.skin.VirtualFlow.computeViewportOffset(VirtualFlow.java:2528)	at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1189)	at javafx.scene.Parent.layout(Parent.java:1087)	at javafx.scene.Parent.layout(Parent.java:1093)	at javafx.scene.Parent.layout(Parent.java:1093)	at javafx.scene.Parent.layout(Parent.java:1093)	at javafx.scene.Scene.doLayoutPass(Scene.java:552)	at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2397)	at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:355)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:354)	at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:381)	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:510)	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)	at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)	at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)	at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)	at java.lang.Thread.run(Thread.java:745)