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.componentOpened(IssueTopComponent.java:419)
   at org.openide.windows.WindowManager.componentOpenNotify(WindowManager.java:307)
   at org.netbeans.core.windows.WindowManagerImpl.notifyTopComponentOpened(WindowManagerImpl.java:1106)
   at org.netbeans.core.windows.Central.addModeOpenedTopComponent(Central.java:784)
   at org.netbeans.core.windows.ModeImpl.addOpenedTopComponent(ModeImpl.java:354)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentOpenAtTabPosition(WindowManagerImpl.java:1218)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentOpen(WindowManagerImpl.java:1183)
   at org.openide.windows.TopComponent.open(TopComponent.java:497)
   at org.openide.windows.TopComponent.open(TopComponent.java:477)
   at org.netbeans.modules.bugtracking.ui.issue.IssueAction$1.run(IssueAction.java:98)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
   at java.awt.EventQueue.access$000(EventQueue.java:84)
   at java.awt.EventQueue$1.run(EventQueue.java:602)
   at java.awt.EventQueue$1.run(EventQueue.java:600)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
   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)