java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.sun.javafx.tk.quantum.GlassScene.frameRendered(GlassScene.java:325)
at com.sun.javafx.tk.quantum.PaintCollector.done(PaintCollector.java:284)
at com.sun.javafx.tk.RenderJob.run(RenderJob.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
at java.lang.Thread.run(Thread.java:745)

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