NPE from tickLabelFontProperty().bind() if ObjectProperty's value is null. Sample is attached.

java.lang.NullPointerException
        at javafx.scene.text.Text$4.invalidated(Text.java:234)
        at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:62)
        at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:116)
        at javafx.scene.text.Text.setFont(Text.java:218)
        at javafx.scene.chart.Axis$5.invalidated(Axis.java:129)
        at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:62)
        at javafx.beans.property.ObjectPropertyBase.bind(ObjectPropertyBase.java:152)