java.lang.AssertionError
        at org.netbeans.modules.search.ResultTreeModel.updateRootNodeSelection(ResultTreeModel.java:385)
        at org.netbeans.modules.search.ResultTreeModel.updateRootNodeSelection(ResultTreeModel.java:381)
        at org.netbeans.modules.search.ResultTreeModel.access$500(ResultTreeModel.java:58)
        at org.netbeans.modules.search.ResultTreeModel$Task.run(ResultTreeModel.java:338)
        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:104)
        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)