java.lang.IllegalArgumentException: Called DataObject.find on null
   at org.openide.loaders.DataObject.find(DataObject.java:608)
   at org.netbeans.modules.web.javascript.debugger.MiscEditorUtil.getLineCookie(MiscEditorUtil.java:356)
   at org.netbeans.modules.web.javascript.debugger.MiscEditorUtil.getLineImpl(MiscEditorUtil.java:250)
   at org.netbeans.modules.web.javascript.debugger.MiscEditorUtil.getLine(MiscEditorUtil.java:223)
   at org.netbeans.modules.web.javascript.debugger.callstack.CallStackAnnotationListener.updateAnnotations(CallStackAnnotationListener.java:156)
   at org.netbeans.modules.web.javascript.debugger.callstack.CallStackAnnotationListener.access$100(CallStackAnnotationListener.java:68)
   at org.netbeans.modules.web.javascript.debugger.callstack.CallStackAnnotationListener$DebuggerAnnotationsListener.paused(CallStackAnnotationListener.java:203)
   at org.netbeans.modules.web.webkit.debugging.api.Debugger.notifyPaused(Debugger.java:313)
   at org.netbeans.modules.web.webkit.debugging.api.Debugger.access$700(Debugger.java:75)
   at org.netbeans.modules.web.webkit.debugging.api.Debugger$Callback.handleResponse(Debugger.java:712)
   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$BrowserPluginHandler.handleDebuggerResponse(ExternalBrowserPlugin.java:499)
   at org.netbeans.modules.extbrowser.plugins.ExternalBrowserPlugin$BrowserPluginHandler.read(ExternalBrowserPlugin.java:330)
   at org.netbeans.modules.netserver.websocket.WebSocketHandler7.readDelegate(WebSocketHandler7.java:118)
   at org.netbeans.modules.netserver.websocket.AbstractWSHandler7.readData(AbstractWSHandler7.java:426)
   at org.netbeans.modules.netserver.websocket.AbstractWSHandler7.readFinalFrame(AbstractWSHandler7.java:322)
   at org.netbeans.modules.netserver.websocket.AbstractWSHandler7.read(AbstractWSHandler7.java:148)
   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:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)