java.lang.NullPointerException
   at org.netbeans.modules.viewmodel.TreeModelRoot.destroy(TreeModelRoot.java:290)
   at org.netbeans.modules.viewmodel.OutlineTable.setModel(OutlineTable.java:367)
   at org.netbeans.modules.viewmodel.OutlineTable.setModel(OutlineTable.java:345)
   at org.netbeans.modules.viewmodel.OutlineTable.removeNotify(OutlineTable.java:1083)
   at java.awt.Container.removeNotify(Container.java:2800)
   at javax.swing.JComponent.removeNotify(JComponent.java:4759)
   at java.awt.Container.removeNotify(Container.java:2800)
   at javax.swing.JComponent.removeNotify(JComponent.java:4759)
   at java.awt.Container.remove(Container.java:1199)
   at java.awt.Container.remove(Container.java:1257)
   at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI$ModelListener.indicesChanged(DefaultTabbedContainerUI.java:1243)
   at org.netbeans.swing.tabcontrol.DefaultTabDataModel.fireIndicesChanged(DefaultTabDataModel.java:542)
   at org.netbeans.swing.tabcontrol.DefaultTabDataModel.setTabs(DefaultTabDataModel.java:129)
   at org.netbeans.core.windows.view.ui.tabcontrol.AbstractTabbedImpl.setTopComponents(AbstractTabbedImpl.java:229)
   at org.netbeans.core.windows.view.ui.TabbedHandler.setTopComponents(TabbedHandler.java:168)
   at org.netbeans.core.windows.view.ui.AbstractModeContainer.setTopComponents(AbstractModeContainer.java:126)
   at org.netbeans.core.windows.view.ModeView.setTopComponents(ModeView.java:138)
   at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:283)
   at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:255)
   at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:255)
   at org.netbeans.core.windows.view.ViewHierarchy.updateViewHierarchy(ViewHierarchy.java:169)
   at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:156)
   at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:275)
   at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:251)
   at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:189)
   at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:127)
   at org.netbeans.core.windows.Central.addModeClosedTopComponent(Central.java:880)
   at org.netbeans.core.windows.ModeImpl.addClosedTopComponent(ModeImpl.java:366)
   at org.netbeans.core.windows.ModeImpl.close(ModeImpl.java:281)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentClose(WindowManagerImpl.java:1321)
   at org.openide.windows.TopComponent.close(TopComponent.java:561)
   at org.openide.windows.TopComponent.close(TopComponent.java:548)
   at org.netbeans.modules.debugger.ui.DebuggerManagerListener.closeTopComponentsList(DebuggerManagerListener.java:314)
   at org.netbeans.modules.debugger.ui.DebuggerManagerListener.access$1200(DebuggerManagerListener.java:96)
   at org.netbeans.modules.debugger.ui.DebuggerManagerListener$5.run(DebuggerManagerListener.java:535)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:694)
   at java.awt.EventQueue$3.run(EventQueue.java:692)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)