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

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This exception has no message.
java.lang.NullPointerException:
at javax.swing.plaf.basic.BasicTreeUI.startEditing(BasicTreeUI.java:1959)
at javax.swing.plaf.basic.BasicTreeUI.startEditingAtPath(BasicTreeUI.java:506)
at ru.sirena2000.jxt.iface.action.TreeActionHandler.createNode(TreeActionHandler.java:62)

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