java.lang.NullPointerException
   at org.netbeans.modules.maven.navigator.POMInheritancePanel$POMNode.<init>(POMInheritancePanel.java:277)
   at org.netbeans.modules.maven.navigator.POMInheritancePanel$POMNode.<init>(POMInheritancePanel.java:269)
   at org.netbeans.modules.maven.navigator.POMInheritancePanel$PomChildren.createNodeForKey(POMInheritancePanel.java:261)
   at org.netbeans.modules.maven.navigator.POMInheritancePanel$PomChildren.createNodeForKey(POMInheritancePanel.java:226)
   at org.openide.nodes.ChildFactory.createNodesForKey(ChildFactory.java:120)
   at org.openide.nodes.SynchChildren.createNodes(SynchChildren.java:81)
   at org.openide.nodes.Children$Keys$KE.nodes(Children.java:1648)
   at org.openide.nodes.ChildrenArray.nodesFor(ChildrenArray.java:149)
   at org.openide.nodes.EntrySupport$Default$Info.nodes(EntrySupport.java:935)
   at org.openide.nodes.EntrySupport$Default.updateAdd(EntrySupport.java:522)
   at org.openide.nodes.EntrySupport$Default.setEntries(EntrySupport.java:362)
   at org.openide.nodes.Children$Keys$2.run(Children.java:1542)
   at org.openide.util.Mutex.leaveImpl(Mutex.java:906)
   at org.openide.util.Mutex.leave(Mutex.java:839)
   at org.openide.util.Mutex.readAccess(Mutex.java:367)
   at org.openide.util.Mutex$1R.run(Mutex.java:1307)
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1907)
   at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1326)
   at org.openide.util.Mutex.readAccess(Mutex.java:354)
   at org.openide.explorer.ExplorerManager.setRootContext(ExplorerManager.java:502)
   at org.netbeans.modules.maven.navigator.POMInheritancePanel$2.run(POMInheritancePanel.java:128)
   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:138)
   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)