java.lang.AssertionError
   at org.netbeans.modules.maven.model.pom.impl.VersionablePOMComponentImpl.getGroupId(VersionablePOMComponentImpl.java:65)
   at org.netbeans.modules.maven.navigator.POMModelVisitor$22.generate(POMModelVisitor.java:931)
   at org.netbeans.modules.maven.navigator.POMModelVisitor$22.generate(POMModelVisitor.java:929)
   at org.netbeans.modules.maven.navigator.POMModelVisitor$PomListChildren.createNodes(POMModelVisitor.java:1540)
   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$Default.justComputeNodes(EntrySupport.java:250)
   at org.openide.nodes.ChildrenArray.nodes(ChildrenArray.java:88)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:180)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:225)
   at org.openide.nodes.Children.getNodes(Children.java:462)
   at org.openide.nodes.Children.findChild(Children.java:407)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:218)
   at org.openide.nodes.Children.getNodes(Children.java:494)
   at org.netbeans.modules.maven.navigator.POMModelPanel.updateCaret(POMModelPanel.java:586)
   at org.netbeans.modules.maven.navigator.POMModelPanel.access$100(POMModelPanel.java:114)
   at org.netbeans.modules.maven.navigator.POMModelPanel$1.run(POMModelPanel.java:126)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1960)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1459)
   at org.netbeans.modules.maven.navigator.POMModelPanel.caretUpdate(POMModelPanel.java:564)
   at javax.swing.text.JTextComponent.fireCaretUpdate(JTextComponent.java:391)
   at javax.swing.text.JTextComponent$MutableCaretEvent.fire(JTextComponent.java:4387)
   at javax.swing.text.JTextComponent$MutableCaretEvent.stateChanged(JTextComponent.java:4409)
   at org.netbeans.editor.BaseCaret$4.run(BaseCaret.java:802)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:633)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:138)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)