NpgsqlCopySerializer blows up if no rows are saved

I am not sure if this is the correct place to post my question to. If this is
a wrong list, can you tell me the right one.

I am bulk loading rows using the following code:

const string connString =
"myConnString";
using(var conn = new NpgsqlConnection(connString))
{
conn.Open();
var command = conn.CreateCommand();
var copyStr = string.Format("COPY staging.test(col1,col2) FROM STDIN");
command.CommandText = copyStr;
command.CommandType = CommandType.Text;
var serializer = new NpgsqlCopySerializer(conn);
var copyIn = new NpgsqlCopyIn(command, conn, serializer.ToStream);
copyIn.Start();
foreach (var row in incomingRows)
{
//feed the values here
}
copyIn.End();
serializer.Flush();
serializer.Close();
command.Dispose();
}
If incomingRows has one or more items, this works. However, if no rows are
saved, serializer.Close() blows up:

System.NullReferenceException : Object reference not set to an instance of
an object.
at Npgsql.NpgsqlCopySerializer.Close()

What am I doing wrong?

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