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

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java.lang.NullPointerException:
at javax.swing.plaf.basic.BasicTreeUI.completeEditing(BasicTreeUI.java:1831)
at javax.swing.plaf.basic.BasicTreeUI.completeEditing(BasicTreeUI.java:1815)
at javax.swing.plaf.basic.BasicTreeUI.startEditing(BasicTreeUI.java:1867)
at javax.swing.plaf.basic.BasicTreeUI$MouseHandler.mousePressed(BasicTreeUI.java:2676)
at java.awt.Component.processMouseEvent(Component.java:3707)
at java.awt.Component.processEvent(Component.java:3539)
at java.awt.Container.processEvent(Container.java:1159)
at java.awt.Component.dispatchEventImpl(Component.java:2588)
at java.awt.Container.dispatchEventImpl(Container.java:1208)

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