java.lang.NullPointerException
   at org.netbeans.modules.web.javascript.debugger.browser.NetBeansJavaScriptDebuggerFactoryImpl.createDebuggingSession(NetBeansJavaScriptDebuggerFactoryImpl.java:64)
   at org.netbeans.core.browser.webview.HtmlBrowserImpl$1.run(HtmlBrowserImpl.java:143)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.core.browser.webview.HtmlBrowserImpl.init(HtmlBrowserImpl.java:138)
   at org.netbeans.core.browser.webview.HtmlBrowserImpl.setURL(HtmlBrowserImpl.java:191)
   at org.openide.awt.HtmlBrowser$1URLSetter.run(HtmlBrowser.java:481)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:682)
   at java.awt.EventQueue.access$000(EventQueue.java:85)
   at java.awt.EventQueue$1.run(EventQueue.java:643)
   at java.awt.EventQueue$1.run(EventQueue.java:641)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:652)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)