java.lang.IllegalArgumentException: Original Node from map {position=488, iconResource=org/netbeans/modules/hudson/ui/resources/hudson.png, name=hudson, original=null, displayName=Hudson Builders, instanceCreate=org.openide.nodes.LazyNode@7d417b39[Name=hudson, displayName=Hudson Builders]} is null
   at org.openide.nodes.LazyNode.switchToOriginal(LazyNode.java:85)
   at org.openide.nodes.LazyNode$SwitchChildren.addNotify(LazyNode.java:107)
   at org.openide.nodes.Children.callAddNotify(Children.java:568)
   at org.openide.nodes.EntrySupport$Default.getArray(EntrySupport.java:770)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:172)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:228)
   at org.openide.nodes.EntrySupport$Default.getNodesCount(EntrySupport.java:232)
   at org.openide.nodes.Children.getNodesCount(Children.java:502)
   at org.openide.explorer.view.VisualizerNode.getChildren(VisualizerNode.java:258)
   at org.openide.explorer.view.VisualizerNode.getChildren(VisualizerNode.java:248)
   at org.openide.explorer.view.VisualizerNode.getChildCount(VisualizerNode.java:325)
   at javax.swing.tree.DefaultTreeModel.getChildCount(DefaultTreeModel.java:184)
   at javax.swing.tree.FixedHeightLayoutCache$FHTreeStateNode.expand(FixedHeightLayoutCache.java:1152)
   at javax.swing.tree.FixedHeightLayoutCache.ensurePathIsExpanded(FixedHeightLayoutCache.java:662)
   at javax.swing.tree.FixedHeightLayoutCache.setExpandedState(FixedHeightLayoutCache.java:299)
   at javax.swing.plaf.basic.BasicTreeUI.updateExpandedDescendants(BasicTreeUI.java:1672)
   at javax.swing.plaf.basic.BasicTreeUI$Handler.treeExpanded(BasicTreeUI.java:3755)
   at javax.swing.JTree.fireTreeExpanded(JTree.java:2662)
   at javax.swing.JTree.setExpandedState(JTree.java:3433)
   at javax.swing.JTree.expandPath(JTree.java:2171)
   at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2241)
   at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2228)
   at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2186)
   at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3550)
   at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressedDND(BasicTreeUI.java:3536)
   at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3495)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
   at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
   at java.awt.Component.processMouseEvent(Component.java:6265)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6033)
   at java.awt.Container.processEvent(Container.java:2045)
   at java.awt.Component.dispatchEventImpl(Component.java:4629)
   at java.awt.Container.dispatchEventImpl(Container.java:2103)
   at java.awt.Component.dispatchEvent(Component.java:4455)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4633)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4294)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4227)
   at java.awt.Container.dispatchEventImpl(Container.java:2089)
   at java.awt.Window.dispatchEventImpl(Window.java:2517)
   at java.awt.Component.dispatchEvent(Component.java:4455)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
   at java.awt.EventQueue.access$000(EventQueue.java:96)
   at java.awt.EventQueue$1.run(EventQueue.java:608)
   at java.awt.EventQueue$1.run(EventQueue.java:606)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
   at java.awt.EventQueue$2.run(EventQueue.java:622)
   at java.awt.EventQueue$2.run(EventQueue.java:620)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:153)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)