java.lang.NullPointerException
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:419)
   at org.netbeans.modules.web.webkit.tooling.networkmonitor.DependentFileQueryImpl$DependencyInfo.networkRequest(DependentFileQueryImpl.java:98)
   at org.netbeans.modules.web.webkit.tooling.networkmonitor.NetworkMonitor.networkRequest(NetworkMonitor.java:152)
   at org.netbeans.modules.web.webkit.debugging.api.network.Network.fireNetworkRequest(Network.java:192)
   at org.netbeans.modules.web.webkit.debugging.api.network.Network.requestReceived(Network.java:129)
   at org.netbeans.modules.web.webkit.debugging.api.network.Network.access$1600(Network.java:65)
   at org.netbeans.modules.web.webkit.debugging.api.network.Network$Callback.handleResponse(Network.java:538)
   at org.netbeans.modules.web.webkit.debugging.TransportHelper.notifyListeners(TransportHelper.java:164)
   at org.netbeans.modules.web.webkit.debugging.TransportHelper.access$200(TransportHelper.java:69)
   at org.netbeans.modules.web.webkit.debugging.TransportHelper$Callback.handleResponse(TransportHelper.java:291)
   at org.netbeans.modules.extbrowser.plugins.ExternalBrowserPlugin$BrowserPluginHandler.handleDebuggerResponse(ExternalBrowserPlugin.java:501)
   at org.netbeans.modules.extbrowser.plugins.ExternalBrowserPlugin$BrowserPluginHandler.read(ExternalBrowserPlugin.java:331)
   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:263)
   at org.netbeans.modules.netserver.websocket.AbstractWSHandler7.read(AbstractWSHandler7.java:126)
   at org.netbeans.modules.netserver.websocket.WebSocketServerImpl$WebSocketHandler.read(WebSocketServerImpl.java:207)
   at org.netbeans.modules.netserver.SocketFramework.readData(SocketFramework.java:179)
   at org.netbeans.modules.netserver.SocketFramework.process(SocketFramework.java:153)
   at org.netbeans.modules.netserver.SocketServer.process(SocketServer.java:106)
   at org.netbeans.modules.netserver.SocketFramework.doRun(SocketFramework.java:137)
   at org.netbeans.modules.netserver.SocketServer.run(SocketServer.java:77)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)