#fixed code
                                @Override
    protected Node[] createNodesForKey(BusDescription key) {
        Bus bus = null;
        for(Bus b : project.getBusses()) {
            if(b.getDescription() == key)
                bus = b;
        }
        
        return new Node[] { new BusNode(key, bus) };
    }
#vulnerable code 
                                @Override
    protected Node[] createNodesForKey(BusDescription key) {
        Bus bus = null;
        for(Bus b : project.getBusses()) {
            if(b.getDescription() == key)
                bus = b;
        }

        AbstractNode node = new AbstractNode(Children.create(new MessageNodeFactory(key, bus), true), Lookups.fixed(key, bus));
        node.setIconBaseWithExtension("org/freedesktop/tango/16x16/places/network-workgroup.png");
        node.setDisplayName(bus.getName() + " (" + key.getName() + ")");
        return new Node[] { node };
    } 
                            #location 11 
                            #vulnerability type NULL_DEREFERENCE