java.lang.NullPointerException
   at org.netbeans.modules.navigator.NavigatorController.navigatorTCClosed(NavigatorController.java:217)
   at org.netbeans.modules.navigator.NavigatorController.propertyChange(NavigatorController.java:694)
   at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
   at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryImpl.java:329)
   at org.netbeans.core.windows.RegistryImpl.topComponentClosed(RegistryImpl.java:199)
   at org.netbeans.core.windows.WindowManagerImpl.notifyRegistryTopComponentClosed(WindowManagerImpl.java:1187)
   at org.netbeans.core.windows.WindowManagerImpl.notifyTopComponentClosed(WindowManagerImpl.java:1158)
   at org.netbeans.core.windows.Central.addModeClosedTopComponent(Central.java:900)
   at org.netbeans.core.windows.Central.userClosedTopComponent(Central.java:2032)
   at org.netbeans.core.windows.view.DefaultView.userClosedTopComponent(DefaultView.java:794)
   at org.netbeans.core.windows.view.ui.TabbedHandler.actionPerformed(TabbedHandler.java:337)
   at org.netbeans.swing.tabcontrol.TabbedContainer.postActionEvent(TabbedContainer.java:730)
   at org.netbeans.swing.tabcontrol.TabbedContainerUI.shouldPerformAction(TabbedContainerUI.java:165)
   at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI.access$2700(DefaultTabbedContainerUI.java:112)
   at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI$DisplayerActionListener.actionPerformed(DefaultTabbedContainerUI.java:1286)
   at org.netbeans.swing.tabcontrol.TabDisplayer.postActionEvent(TabDisplayer.java:614)
   at org.netbeans.swing.tabcontrol.TabDisplayerUI.shouldPerformAction(TabDisplayerUI.java:213)
   at org.netbeans.swing.tabcontrol.TabDisplayerUI.postTabAction(TabDisplayerUI.java:298)
   at org.netbeans.swing.tabcontrol.plaf.AbstractWinViewTabDisplayerUI.postTabAction(AbstractWinViewTabDisplayerUI.java:415)
   at org.netbeans.swing.tabcontrol.plaf.Windows8ViewTabDisplayerUI.postTabAction(Windows8ViewTabDisplayerUI.java:64)
   at org.netbeans.swing.tabcontrol.plaf.TabControlButton.performAction(TabControlButton.java:215)
   at org.netbeans.swing.tabcontrol.plaf.TabControlButton.fireActionPerformed(TabControlButton.java:206)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
   at java.awt.Component.processMouseEvent(Component.java:6525)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
   at java.awt.Component.processEvent(Component.java:6290)
   at java.awt.Container.processEvent(Container.java:2234)
   at java.awt.Component.dispatchEventImpl(Component.java:4881)
   at java.awt.Container.dispatchEventImpl(Container.java:2292)
   at java.awt.Component.dispatchEvent(Component.java:4703)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4898)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4533)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4462)
   at java.awt.Container.dispatchEventImpl(Container.java:2278)
   at java.awt.Window.dispatchEventImpl(Window.java:2739)
   at java.awt.Component.dispatchEvent(Component.java:4703)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
   at java.awt.EventQueue.access$400(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:697)
   at java.awt.EventQueue$3.run(EventQueue.java:691)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:719)
   at java.awt.EventQueue$4.run(EventQueue.java:717)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)