java.lang.IllegalArgumentException: Original Node from map {position=400, iconResource=org/netbeans/modules/server/ui/resources/servers.png, shortDescription=Servers registered in the IDE, name=servers, original=null, displayName=Servers, instanceCreate=org.openide.nodes.LazyNode@a7634[Name=servers, displayName=Servers]} is null
   at org.openide.nodes.LazyNode.switchToOriginal(LazyNode.java:85)
   at org.openide.nodes.LazyNode$SwitchChildren.getNodesCount(LazyNode.java:119)
   at org.openide.explorer.view.TreeView$6.run(TreeView.java:1005)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)