Run log:
Exception in runnable
java.lang.NullPointerException
at javafx.embed.swing.SwingNode.ungrabFocus(SwingNode.java:561)
at javafx.embed.swing.SwingNode.access$400(SwingNode.java:112)
at javafx.embed.swing.SwingNode$SwingNodeContent$2.run(SwingNode.java:550)
at com.sun.javafx.application.PlatformImpl$5$1.run(PlatformImpl.java:223)
at com.sun.javafx.application.PlatformImpl$5$1.run(PlatformImpl.java:220)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:220)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:94)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:101)
at java.lang.Thread.run(Thread.java:724)

It happens after closing the window if JMenuBar has focus.

To reproduce:
1. compile and run SwingNodeJMenuBar
2. close window.

If JMenuBar does not have focus there are no exceptions.