#vulnerable code 
                                void buildTupleType() {
        Scope bt = BaseTuple.getTable();
        String[] tuple_methods = {
            "__add__", "__contains__", "__eq__", "__ge__", "__getnewargs__",
            "__gt__", "__iter__", "__le__", "__len__", "__lt__", "__mul__",
            "__ne__", "__new__", "__rmul__", "count", "index"
        };
        for (String m : tuple_methods) {
            bt.update(m, newLibUrl("stdtypes"), newFunc(), METHOD);
        }
        Binding b = bt.update("__getslice__", newDataModelUrl("object.__getslice__"),
                               newFunc(), METHOD);
        b.markDeprecated();
        bt.update("__getitem__", newDataModelUrl("object.__getitem__"), newFunc(), METHOD);
        bt.update("__iter__", newDataModelUrl("object.__iter__"), newFunc(), METHOD);
    } 
                            #location 13 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                String[] list(String... names) {
        return names;
    }