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

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java.lang.NullPointerException:
at javax.swing.plaf.basic.BasicTreeUI.completeEditing(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI.completeEditing(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI$Handler.valueChanged(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.removeSelectionPaths(Unknown Source)
at javax.swing.JTree.removeDescendantSelectedPaths(Unknown Source)
at javax.swing.JTree.removeDescendantSelectedPaths(Unknown Source)
at javax.swing.JTree$TreeModelHandler.treeNodesRemoved(Unknown Source)
at javax.swing.tree.DefaultTreeModel.fireTreeNodesRemoved(Unknown Source)
at javax.swing.tree.DefaultTreeModel.nodesWereRemoved(Unknown Source)
at undefined.TreeBasic.promote(TreeBasic.java:62)

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