java.lang.IllegalArgumentException: Original Node from map {position=101, iconResource=org/netbeans/modules/db/resources/database.gif, name=Databases, original=null, displayName=Databases, instanceCreate=org.openide.nodes.LazyNode[name=null][Name=Databases, displayName=Databases]} 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)