B4J Library jGauges

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Program started.
java.lang.NullPointerException
at eu.hansolo.medusa.skins.IndicatorSkin.handleEvents(IndicatorSkin.java:251)
at eu.hansolo.medusa.skins.GaugeSkinBase.lambda$2(GaugeSkinBase.java:51)
at eu.hansolo.medusa.Gauge.fireUpdateEvent(Gauge.java:5826)
at eu.hansolo.medusa.Gauge.lambda$0(Gauge.java:788)
at javafx.animation.Animation.impl_finished(Animation.java:1132)
at javafx.animation.AnimationAccessorImpl.finished(AnimationAccessorImpl.java:49)
at com.sun.scenario.animation.shared.SingleLoopClipEnvelope.timePulse(SingleLoopClipEnvelope.java:103)
at javafx.animation.Animation.impl_timePulse(Animation.java:1102)
at javafx.animation.Animation$1.lambda$timePulse$25(Animation.java:186)
at java.security.AccessController.doPrivileged(Native Method)
at javafx.animation.Animation$1.timePulse(Animation.java:185)
at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:344)
at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:267)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:506)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)

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