Use s3-streamlogger with DigitalOcean Spaces

I am using s3-streamlogger along with DigitalOcean Spaces, and in order to create logs into my bucket I use the following code:

import { S3StreamLogger } from 's3-streamlogger';

const s3Stream = new S3StreamLogger({
  bucket: "mybucket",
  config: {
    endpoint: 'nyc3.digitaloceanspaces.com'
  },
  access_key_id: "MY_ACCESS_KEY",
  secret_access_key: "MY_SECRET_KEY",
  tags: {type: "error", project: "myproject"}
});

s3Stream.write("hello S3");

In the configuguration, if I omit the tags: {type: "error", project: "myproject"} an InvalidArgument: Null exception is raised.

Is this a normal behavior or an incompatibility with S3?