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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 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)	at java.lang.Thread.run(Thread.java:745)