As b34 I am receiving the following NPE when calling ListView.getItems().add(). This NPE did not occur in b32. It should be noted that the call to add() is occuring within the run method of a Runnable passed to Platform.runlater().

java.lang.NullPointerException
at javafx.scene.control.ListCell$5.invalidated(ListCell.java:131)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:62)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:116)
at javafx.scene.control.ListCell.setListView(ListCell.java:89)
at javafx.scene.control.ListCell.impl_updateListView(ListCell.java:252)
at com.sun.javafx.scene.control.skin.ListViewSkin.updateCellCount(ListViewSkin.java:149)
at com.sun.javafx.scene.control.skin.ListViewSkin.access$600(ListViewSkin.java:26)
at com.sun.javafx.scene.control.skin.ListViewSkin$12.onChanged(ListViewSkin.java:119)
at com.sun.javafx.collections.ObservableListWrapper.callObservers(ObservableListWrapper.java:62)
at com.sun.javafx.collections.ObservableListWrapper.add(ObservableListWrapper.java:81)
at com.sun.javafx.collections.ObservableListWrapper.add(ObservableListWrapper.java:74)
at com.sri.tasklearning.ui.demonstrator.ProcedureDemonstrator$2$1.run(ProcedureDemonstrator.java:88)