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

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java.lang.NullPointerException:
at javax.swing.SwingUtilities.getWindowAncestor(SwingUtilities.java:63)
at com.sun.java.swing.plaf.windows.WindowsPopupMenuUI$AltProcessor.altReleased(WindowsPopupMenuUI.java:115)
at com.sun.java.swing.plaf.windows.WindowsPopupMenuUI$AltProcessor.postProcessKeyEvent(WindowsPopupMenuUI.java:138)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:603)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:765)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:698)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:559)
at java.awt.Component.dispatchEventImpl(Component.java:3468)
at java.awt.Container.dispatchEventImpl(Container.java:1623)
at java.awt.Window.dispatchEventImpl(Window.java:1585)
at java.awt.Component.dispatchEvent(Component.java:3439)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

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