Trying to add another answer to a card produces following error, and screws up the designer view. See attached picture for more information.
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Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at fi.nmi.neure.taskdesigner.controls.cells.StateListCell.prepareEditingView(Unknown Source)
at fi.nmi.neure.taskdesigner.controls.cells.AnswerListCell.prepareEditingView(Unknown Source)
at fi.nmi.neure.taskdesigner.controls.cells.AnswerListCell.prepareEditingView(Unknown Source)
at fi.nmi.neure.taskdesigner.controls.cells.StateListCell.updateGraphics(Unknown Source)
at fi.nmi.neure.taskdesigner.controls.cells.StateListCell.updateItem(Unknown Source)
at fi.nmi.neure.taskdesigner.controls.cells.StateListCell.updateItem(Unknown Source)
at javafx.scene.control.ListCell.updateItem(ListCell.java:451)
at javafx.scene.control.ListCell.indexChanged(ListCell.java:310)
at javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:116)
at com.sun.javafx.scene.control.skin.VirtualFlow.setCellIndex(VirtualFlow.java:1916)
at com.sun.javafx.scene.control.skin.VirtualFlow.addTrailingCells(VirtualFlow.java:1330)
at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1194)
at javafx.scene.Parent.layout(Parent.java:1074)
at javafx.scene.Parent.layout(Parent.java:1080)
at javafx.scene.Parent.layout(Parent.java:1080)
at javafx.scene.Scene.doLayoutPass(Scene.java:532)
at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2363)
at com.sun.javafx.tk.Toolkit.lambda$runPulse$28(Toolkit.java:314)
at com.sun.javafx.tk.Toolkit$$Lambda$348/1308247981.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:313)
at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:340)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:451)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:431)
at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$363(QuantumToolkit.java:298)
at com.sun.javafx.tk.quantum.QuantumToolkit$$Lambda$70/1503746136.run(Unknown Source)