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