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java.lang.NullPointerException: 	at javax.swing.text.View.getViewIndex(View.java:1060)	at javax.swing.text.View.getToolTipText(View.java:1031)	at javax.swing.plaf.basic.BasicTextUI.getToolTipText(BasicTextUI.java:1057)	at javax.swing.text.JTextComponent.getToolTipText(JTextComponent.java:1533)	at javax.swing.JTable.getToolTipText(JTable.java:2380)	at javax.swing.ToolTipManager$insideTimerAction.actionPerformed(ToolTipManager.java:669)	at javax.swing.Timer.fireActionPerformed(Timer.java:256)	at javax.swing.Timer$DoPostEvent.run(Timer.java:190)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:167)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)	at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:131)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)