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$5$1.run(IssueTopComponent.java:364)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:677)
   at java.awt.EventQueue.access$000(EventQueue.java:85)
   at java.awt.EventQueue$1.run(EventQueue.java:638)
   at java.awt.EventQueue$1.run(EventQueue.java:636)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:647)
   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)