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

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java.lang.NullPointerException:
at javax.swing.plaf.basic.BasicTableUI$TableTransferHandler$TableTransferable.getHTMLData(BasicTableUI.java:1360)
at javax.swing.plaf.basic.BasicTransferable.getTransferData(BasicTransferable.java:116)
at sun.awt.datatransfer.DataTransferer.translateTransferable(DataTransferer.java:1001)
at sun.awt.windows.WDataTransferer.translateTransferable(WDataTransferer.java:144)
at sun.awt.windows.WClipboard.setContents(WClipboard.java:75)
at javax.swing.TransferHandler.exportToClipboard(TransferHandler.java:206)
at javax.swing.TransferHandler$TransferAction.actionPerformed(TransferHandler.java:809)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1502)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2422)
at javax.swing.JTable.processKeyBinding(JTable.java:3243)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2468)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2385)
at java.awt.Component.processEvent(Component.java:4830)
at java.awt.Container.processEvent(Container.java:1380)
at java.awt.Component.dispatchEventImpl(Component.java:3526)
at java.awt.Container.dispatchEventImpl(Container.java:1437)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1700)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:568)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:739)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:673)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:534)
at java.awt.Component.dispatchEventImpl(Component.java:3396)
at java.awt.Container.dispatchEventImpl(Container.java:1437)
at java.awt.Window.dispatchEventImpl(Window.java:1566)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)

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