java.lang.NullPointerException
   at org.netbeans.modules.web.inspect.webkit.ui.MatchedPropertyNode.<init>(MatchedPropertyNode.java:99)
   at org.netbeans.modules.web.inspect.webkit.ui.MatchedPropertiesNode.addChildrenFor(MatchedPropertiesNode.java:145)
   at org.netbeans.modules.web.inspect.webkit.ui.MatchedPropertiesNode.initChildren(MatchedPropertiesNode.java:107)
   at org.netbeans.modules.web.inspect.webkit.ui.MatchedPropertiesNode.<init>(MatchedPropertiesNode.java:88)
   at org.netbeans.modules.web.inspect.webkit.ui.CSSStylesSelectionPanel.updateMatchedRules(CSSStylesSelectionPanel.java:644)
   at org.netbeans.modules.web.inspect.webkit.ui.CSSStylesSelectionPanel$9.run(CSSStylesSelectionPanel.java:628)
   at org.openide.util.RequestProcessor$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$Processor.run(RequestProcessor.java:2058)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:420)
   at org.netbeans.modules.web.inspect.webkit.ui.CSSStylesSelectionPanel.updateMatchedRules(CSSStylesSelectionPanel.java:625)
   at org.netbeans.modules.web.inspect.webkit.ui.CSSStylesSelectionPanel.updateContentImpl(CSSStylesSelectionPanel.java:603)
   at org.netbeans.modules.web.inspect.webkit.ui.CSSStylesSelectionPanel$8.run(CSSStylesSelectionPanel.java:546)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)