Sometimes CoffeeCup app (apps/internal/CoffeeCup) throws this exception. Unfortunately, it is not constantly reproducible.

java.lang.ArithmeticException: / by zero
at com.sun.scenario.animation.shared.GeneralClipEnvelope.jumpTo(GeneralClipEnvelope.java:293)
at javafx.animation.Animation.jumpTo(Animation.java:495)
at javafx.animation.SequentialTransition.impl_playTo(SequentialTransition.java:373)
at com.sun.scenario.animation.shared.GeneralClipEnvelope.timePulse(GeneralClipEnvelope.java:238)
at javafx.animation.Animation.impl_timePulse(Animation.java:786)
at com.sun.scenario.animation.shared.AnimationPulseReceiver.timePulse(AnimationPulseReceiver.java:85)
at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:360)
at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:280)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:358)
at com.sun.javafx.tk.quantum.QuantumToolkit$10.run(QuantumToolkit.java:297)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$1$1.run(WinApplication.java:49)
at java.lang.Thread.run(Thread.java:662)