#vulnerable code 
                                @Override
    public LookbackQuery withFilter(Filter filter) {
        return withDataSource(new QueryDataSource(getInnerQuery().withFilter(filter)));
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public LookbackQuery withFilter(Filter filter) {
        return withDataSource(new QueryDataSource(getInnerQueryUnchecked().withFilter(filter)));
    }