java.lang.AssertionError
   at org.netbeans.modules.xml.xam.AbstractModelFactory.getModel(AbstractModelFactory.java:133)
   at org.netbeans.modules.maven.model.pom.POMModelFactory.getModel(POMModelFactory.java:82)
   at org.netbeans.modules.maven.repository.ui.ArtifactMultiViewFactory$2.run(ArtifactMultiViewFactory.java:270)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.maven.repository.ui.ArtifactMultiViewFactory.createPomEditorLookup(ArtifactMultiViewFactory.java:259)
   at org.netbeans.modules.maven.repository.ui.ArtifactMultiViewFactory.createLookup(ArtifactMultiViewFactory.java:120)
   at org.netbeans.modules.maven.graph.DependencyGraphTopComponent$1L.reset(DependencyGraphTopComponent.java:163)
   at org.netbeans.modules.maven.graph.DependencyGraphTopComponent$1L.propertyChange(DependencyGraphTopComponent.java:157)
   at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:196)
   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.modules.maven.api.NbMavenProject.doFireReload(NbMavenProject.java:526)
   at org.netbeans.modules.maven.api.NbMavenProject.access$200(NbMavenProject.java:94)
   at org.netbeans.modules.maven.api.NbMavenProject$AccessorImpl.doFireReload(NbMavenProject.java:136)
   at org.netbeans.modules.maven.NbMavenProjectImpl.fireProjectReload(NbMavenProjectImpl.java:396)
   at org.netbeans.modules.maven.api.NbMavenProject.fireProjectReload(NbMavenProject.java:520)
   at org.netbeans.modules.maven.api.NbMavenProject.fireMavenProjectReload(NbMavenProject.java:539)
   at org.netbeans.modules.maven.execute.MavenCommandLineExecutor$1.run(MavenCommandLineExecutor.java:229)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)