java.lang.NullPointerException
   at org.netbeans.modules.web.clientproject.api.ServerURLMapping.fromServer(ServerURLMapping.java:101)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanelUI.getInspectedFileFromPageModel(HtmlNavigatorPanelUI.java:282)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanelUI.pageModelDocumentChanged(HtmlNavigatorPanelUI.java:223)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanelUI.access$100(HtmlNavigatorPanelUI.java:93)
   at org.netbeans.modules.html.navigator.HtmlNavigatorPanelUI$2.propertyChange(HtmlNavigatorPanelUI.java:126)
   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.web.inspect.PageModel.firePropertyChange(PageModel.java:183)
   at org.netbeans.modules.web.inspect.webkit.WebKitPageModel.access$600(WebKitPageModel.java:69)
   at org.netbeans.modules.web.inspect.webkit.WebKitPageModel$1$1.run(WebKitPageModel.java:260)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.web.inspect.webkit.WebKitPageModel$1.documentUpdated(WebKitPageModel.java:257)
   at org.netbeans.modules.web.webkit.debugging.api.dom.DOM.notifyDocumentUpdated(DOM.java:496)
   at org.netbeans.modules.web.webkit.debugging.api.dom.DOM.handleDocumentUpdated(DOM.java:607)
   at org.netbeans.modules.web.webkit.debugging.api.dom.DOM$Callback.handleResponse(DOM.java:731)
   at org.netbeans.modules.web.webkit.debugging.TransportHelper.notifyListeners(TransportHelper.java:135)
   at org.netbeans.modules.web.webkit.debugging.TransportHelper.access$200(TransportHelper.java:64)
   at org.netbeans.modules.web.webkit.debugging.TransportHelper$Callback.handleResponse(TransportHelper.java:232)
   at org.netbeans.modules.extbrowser.plugins.ExternalBrowserPlugin$BrowserPluginHandler.handleDebuggerResponse(ExternalBrowserPlugin.java:377)
   at org.netbeans.modules.extbrowser.plugins.ExternalBrowserPlugin$BrowserPluginHandler.read(ExternalBrowserPlugin.java:264)
   at org.netbeans.modules.netserver.websocket.WebSocketHandler7.readDelegate(WebSocketHandler7.java:118)
   at org.netbeans.modules.netserver.websocket.AbstractWSHandler7.readData(AbstractWSHandler7.java:301)
   at org.netbeans.modules.netserver.websocket.AbstractWSHandler7.readFinalFrame(AbstractWSHandler7.java:244)
   at org.netbeans.modules.netserver.websocket.AbstractWSHandler7.read(AbstractWSHandler7.java:126)
   at org.netbeans.modules.netserver.websocket.WebSocketServer$WebSocketHandler.read(WebSocketServer.java:206)
   at org.netbeans.modules.netserver.SocketFramework.readData(SocketFramework.java:175)
   at org.netbeans.modules.netserver.SocketFramework.process(SocketFramework.java:149)
   at org.netbeans.modules.netserver.SocketServer.process(SocketServer.java:106)
   at org.netbeans.modules.netserver.SocketFramework.doRun(SocketFramework.java:136)
   at org.netbeans.modules.netserver.SocketServer.run(SocketServer.java:77)
   at java.lang.Thread.run(Thread.java:722)