#vulnerable code 
                                @Override
    public boolean remove(Object o) {
        RedisConnection<String, Object> connection = connectionManager.connectionWriteOp();
        try {
            return connection.lrem(getName(), 1, o) > 0;
        } finally {
            connectionManager.release(connection);
        }
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public boolean remove(Object o) {
        return remove(o, 1);
    }