java.lang.NullPointerException
   at org.netbeans.modules.bugtracking.spi.BugtrackingFactory.getIssueImpl(BugtrackingFactory.java:127)
   at org.netbeans.modules.bugtracking.spi.BugtrackingFactory.getUndoRedoSupport(BugtrackingFactory.java:108)
   at org.netbeans.modules.bugzilla.Bugzilla.getUndoRedoSupport(Bugzilla.java:167)
   at org.netbeans.modules.bugzilla.issue.IssuePanel.opened(IssuePanel.java:3040)
   at org.netbeans.modules.bugzilla.issue.IssueController.opened(IssueController.java:87)
   at org.netbeans.modules.bugtracking.ui.issue.IssueTopComponent.setIssue(IssueTopComponent.java:210)
   at org.netbeans.modules.bugtracking.ui.issue.IssueAction$3$1$1.run(IssueAction.java:213)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)