java.lang.NullPointerException
   at org.netbeans.modules.editor.lib2.view.EditorBoxView.getViewIndexChecked(EditorBoxView.java:386)
   at org.netbeans.modules.editor.lib2.view.EditorView.getViewIndex(EditorView.java:374)
   at javax.swing.text.View.getToolTipText(View.java:1010)
   at javax.swing.text.View.getToolTipText(View.java:1016)
   at javax.swing.text.View.getToolTipText(View.java:1016)
   at javax.swing.plaf.basic.BasicTextUI.getToolTipText(BasicTextUI.java:1228)
   at org.netbeans.modules.editor.NbToolTip.buildTip(NbToolTip.java:227)
   at org.netbeans.modules.editor.NbToolTip.buildToolTip(NbToolTip.java:110)
   at org.netbeans.modules.editor.NbEditorKit$NbBuildToolTipAction.actionPerformed(NbEditorKit.java:620)
   at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:336)
   at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:137)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:92)
   at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:113)
   at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:96)
   at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:140)
   at org.netbeans.editor.ext.ToolTipSupport.updateToolTip(ToolTipSupport.java:483)
   at org.netbeans.editor.ext.ToolTipSupport.setToolTipVisible(ToolTipSupport.java:513)
   at org.netbeans.editor.ext.ToolTipSupport$Listener.actionPerformed(ToolTipSupport.java:959)
   at org.netbeans.editor.WeakTimerListener.actionPerformed(WeakTimerListener.java:85)
   at javax.swing.Timer.fireActionPerformed(Timer.java:271)
   at javax.swing.Timer$DoPostEvent.run(Timer.java:201)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:133)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)