Loop data on request multipart field

Question

Im using request multipart field on JS, but why my input data its giving some loop like this :

{ name_speaker: 'oklee' }
{ name_speaker: 'oklee', topic: 'yes' }
{ name_speaker: 'oklee', topic: 'yes', study_program: 'test' }
{
  name_speaker: 'oklee',
  topic: 'yes',
  study_program: 'test',
  schedule: '2022-01-05'
}

I just want get last result :

{
  name_speaker: 'oklee',
  topic: 'yes',
  study_program: 'test',
  schedule: '2022-01-05'
}

This is my code for get that :

async submitData({response, request}) {
      var body = {}
      request.multipart.field((name, value) => {
        body[name] = value

        console.log(body)
      }).process()
}