java.lang.NullPointerException
   at org.openide.util.lookup.ProxyLookup$R.lookupChange(ProxyLookup.java:461)
   at org.openide.util.lookup.ProxyLookup.setData(ProxyLookup.java:314)
   at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:153)
   at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:126)
   at org.netbeans.core.multiview.MultiViewTopComponentLookup$MyProxyLookup.setElementLookup(MultiViewTopComponentLookup.java:208)
   at org.netbeans.core.multiview.MultiViewTopComponentLookup.setElementLookup(MultiViewTopComponentLookup.java:71)
   at org.netbeans.core.multiview.MultiViewPeer.assignLookup(MultiViewPeer.java:241)
   at org.netbeans.core.multiview.MultiViewPeer.assignLookup(MultiViewPeer.java:253)
   at org.netbeans.core.multiview.MultiViewCloneableTopComponent.getLookup(MultiViewCloneableTopComponent.java:118)
   at org.netbeans.modules.localhistory.LocalHistory$OpenedFilesListener.getFiles(LocalHistory.java:538)
   at org.netbeans.modules.localhistory.LocalHistory$OpenedFilesListener.access$200(LocalHistory.java:454)
   at org.netbeans.modules.localhistory.LocalHistory$OpenedFilesListener$1.run(LocalHistory.java:465)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.localhistory.LocalHistory$OpenedFilesListener.propertyChange(LocalHistory.java:458)
   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.topComponentOpened(RegistryImpl.java:187)
   at org.netbeans.core.windows.WindowManagerImpl.notifyRegistryTopComponentOpened(WindowManagerImpl.java:1178)
   at org.netbeans.core.windows.WindowManagerImpl.notifyTopComponentOpened(WindowManagerImpl.java:1146)
   at org.netbeans.core.windows.Central.addModeOpenedTopComponent(Central.java:798)
   at org.netbeans.core.windows.ModeImpl.addOpenedTopComponent(ModeImpl.java:354)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentOpenAtTabPosition(WindowManagerImpl.java:1256)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentOpen(WindowManagerImpl.java:1221)
   at org.openide.windows.TopComponent.open(TopComponent.java:497)
   at org.openide.windows.TopComponent.open(TopComponent.java:477)
   at org.openide.windows.CloneableOpenSupport.openCloneableTopComponent(CloneableOpenSupport.java:202)
   at org.openide.windows.CloneableOpenSupport$1.run(CloneableOpenSupport.java:101)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:727)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:688)
   at java.awt.EventQueue$3.run(EventQueue.java:686)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:697)
   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)