java.lang.NullPointerException
   at org.netbeans.modules.db.explorer.node.IndexNodeProvider$IndexComparator.compare(IndexNodeProvider.java:138)
   at org.netbeans.modules.db.explorer.node.IndexNodeProvider$IndexComparator.compare(IndexNodeProvider.java:134)
   at java.util.TreeMap.compare(TreeMap.java:1291)
   at java.util.TreeMap.put(TreeMap.java:538)
   at java.util.TreeSet.add(TreeSet.java:255)
   at java.util.AbstractCollection.addAll(AbstractCollection.java:344)
   at java.util.TreeSet.addAll(TreeSet.java:312)
   at org.netbeans.api.db.explorer.node.NodeProvider.setNodes(NodeProvider.java:192)
   at org.netbeans.modules.db.explorer.node.IndexNodeProvider.initialize(IndexNodeProvider.java:131)
   at org.netbeans.api.db.explorer.node.NodeProvider.getNodes(NodeProvider.java:107)
   at org.netbeans.modules.db.explorer.node.NodeRegistry.getNodes(NodeRegistry.java:171)
   at org.netbeans.api.db.explorer.node.ChildNodeFactory.createKeys(ChildNodeFactory.java:108)
   at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:209)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)