java.lang.AssertionError
   at org.netbeans.modules.web.webkit.debugging.TransportHelper.sendBlockingCommand(TransportHelper.java:113)
   at org.netbeans.modules.web.webkit.debugging.api.dom.DOM.getDocument(DOM.java:101)
   at org.netbeans.modules.web.inspect.webkit.WebKitPageModel.getDocumentNode(WebKitPageModel.java:210)
   at org.netbeans.modules.web.inspect.webkit.WebKitPageModel.getDocumentURL(WebKitPageModel.java:232)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanelUI.getInspectedFile(HtmlNavigatorPanelUI.java:267)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanelUI.setPageModel(HtmlNavigatorPanelUI.java:222)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanelUI.refresh(HtmlNavigatorPanelUI.java:385)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanelUI.activate(HtmlNavigatorPanelUI.java:352)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanel.panelActivated(HtmlNavigatorPanel.java:77)
   at org.netbeans.modules.navigator.LazyPanel.panelActivated(LazyPanel.java:100)
   at org.netbeans.modules.navigator.NavigatorController.showProviders(NavigatorController.java:499)
   at org.netbeans.modules.navigator.NavigatorController.access$300(NavigatorController.java:101)
   at org.netbeans.modules.navigator.NavigatorController$1$1.run(NavigatorController.java:412)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:682)
   at java.awt.EventQueue$3.run(EventQueue.java:680)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   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)