``` SEVERE: Uncaught error java.lang.NullPointerEx...

# tornadofx

[beepdog]

SEVERE: Uncaught error
java.lang.NullPointerException
	at javafx.scene.control.SpinnerValueFactory$IntegerSpinnerValueFactory.lambda$new$200(SpinnerValueFactory.java:475)
	at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361)
	at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
	at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
	at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
	at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
	at javafx.beans.property.ObjectProperty.setValue(ObjectProperty.java:69)
	at com.sun.javafx.binding.BidirectionalBinding.bind(BidirectionalBinding.java:64)
	at javafx.beans.binding.Bindings.bindBidirectional(Bindings.java:757)
	at javafx.beans.property.ObjectProperty.bindBidirectional(ObjectProperty.java:77)
	at sgg.rtr.localizationeditor.configuration.PropertiesEditingView$root$1$1$1$4$1.invoke(PropertiesEditingView.kt:217)