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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.grabContainer(BasicPopupMenuUI.java:344)	at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.requestAddGrab(BasicPopupMenuUI.java:227)	at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.stateChanged(BasicPopupMenuUI.java:273)