HelloIconified throws RuntimeException on WindowStage.setIconfied failure on Mac

     [java] Exception in Application start method
     [java] Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
     [java] at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:399)
     [java] at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:47)
     [java] at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:115)
     [java] at java.lang.Thread.run(Thread.java:680)
     [java] Caused by: java.lang.RuntimeException: WindowStage.setIconified failed
     [java] at com.sun.javafx.tk.quantum.WindowStage.setIconified(WindowStage.java:442)
     [java] at javafx.stage.Stage.impl_visibleChanging(Stage.java:819)
     [java] at javafx.stage.Window$10.invalidated(Window.java:662)
     [java] at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:129)
     [java] at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:163)
     [java] at javafx.stage.Window.setShowing(Window.java:757)
     [java] at javafx.stage.Window.show(Window.java:772)
     [java] at javafx.stage.Stage.show(Stage.java:157)
     [java] at helloworld.HelloIconified.start(HelloIconified.java:16)
     [java] at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:315)
     [java] at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:174)
     [java] at com.sun.javafx.application.PlatformImpl$3.run(PlatformImpl.java:141)
     [java] Java Result: 1