When calling statObject method with a valid, existent bucket and object key crashes with Null check operator used on a null value at following line:

return StatObjectResult(
      etag: etag,
      size: int.parse(resp.headers['content-length']!), // <------ Here
      metaData: extractMetadata(resp.headers),
      lastModified: parseRfc7231Time(resp.headers['last-modified']!),
      acl: retrieveAcls ? await getObjectACL(bucket, object) : null,
    );

Stacktrace:

Null check operator used on a null value
#0      Minio.statObject (package:minio/src/minio.dart:1136:53)
<asynchronous suspension>
#1      Future.timeout.<anonymous closure> (dart:async/future_impl.dart:1061:7)
<asynchronous suspension>

I debugged it and turns out, resp.headers is missing content-length field, hence the crash. I also noticed that size is a nullable param. So this can easily be solved by using int.tryParse instead of int.parse (Unless it is a real deep issue!).