java.lang.IllegalArgumentException: null source

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java.lang.IllegalArgumentException: null source
at java.util.EventObject.(EventObject.java:34)
at java.awt.AWTEvent.(AWTEvent.java:225)
at java.awt.event.ComponentEvent.(ComponentEvent.java:94)
at java.awt.event.WindowEvent.(WindowEvent.java:175)
at java.awt.event.WindowEvent.(WindowEvent.java:212)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:518)
at java.awt.Component.dispatchEventImpl(Component.java:3396)
at java.awt.Container.dispatchEventImpl(Container.java:1437)
at java.awt.Window.dispatchEventImpl(Window.java:1566)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
at java.awt.SequencedEvent.dispatch(SequencedEvent.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:443)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)

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