java.lang.IllegalArgumentException: null source

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java.lang.IllegalArgumentException: null source
at java.util.EventObject.(EventObject.java:56)
at java.awt.AWTEvent.(AWTEvent.java:337)
at java.awt.event.InvocationEvent.(InvocationEvent.java:224)
at java.awt.event.InvocationEvent.(InvocationEvent.java:188)
at java.awt.event.InvocationEvent.(InvocationEvent.java:150)
at sun.awt.X11.XBaseMenuWindow.dispose(XBaseMenuWindow.java:907)

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