Exception in thread when clicking on node - javafx

Question

I have a JavaFX application with TreeView. When I click multiple times on a tree node I get this error stack:
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at com.sun.javafx.css.StyleManager.findMatchingStyles(Unknown Source)
at javafx.scene.CssStyleHelper.createStyleHelper(Unknown Source)
at javafx.scene.Node.reapplyCss(Unknown Source)
at javafx.scene.Node.impl_reapplyCSS(Unknown Source)
at javafx.scene.Node.invalidatedScenes(Unknown Source)
at javafx.scene.Node.setScenes(Unknown Source)
at javafx.scene.Parent$1.onChanged(Unknown Source)
at com.sun.javafx.collections.TrackableObservableList.lambda$new$19(Unknown Source)
at com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(Unknown Sourc
e)
at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(Unknown Source)
at javafx.collections.ObservableListBase.fireChange(Unknown Source)
at javafx.collections.ListChangeBuilder.commit(Unknown Source)
at javafx.collections.ListChangeBuilder.endChange(Unknown Source)
at javafx.collections.ObservableListBase.endChange(Unknown Source)
at javafx.collections.ModifiableObservableListBase.add(Unknown Source)
at java.util.AbstractList.add(Unknown Source)
at com.sun.javafx.collections.VetoableListDecorator.add(Unknown Source)
at javafx.scene.chart.Axis.layoutChildren(Unknown Source)
at javafx.scene.chart.ValueAxis.layoutChildren(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.chart.XYChart.layoutChartChildren(Unknown Source)
at javafx.scene.chart.Chart$1.layoutChildren(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Parent.layout(Unknown Source)
at javafx.scene.Scene.doLayoutPass(Unknown Source)
at javafx.scene.Scene$ScenePulseListener.pulse(Unknown Source)
at com.sun.javafx.tk.Toolkit.lambda$runPulse$31(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.Toolkit.runPulse(Unknown Source)
at com.sun.javafx.tk.Toolkit.firePulse(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$401(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$146(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Into the error stack I see only internal JavaFX error. Can you give me some guide what might be the problem?