Why is it impossible to write data from the database to the fields of nested structures?

Question

go

Good day! There is an IndexPage structure in which the Post structure is nested. I'm trying to fill it with data from the database, but I get the error "runtime error: invalid memory address or nil pointer dereference", but if I try to fill the Post structure directly, everything goes well.
I can’t write to Post right away. In addition to this structure, there are more that need to be invested in one - IndexPage
Actually the code itself. Right now IndexPage has only one nested structure.

var (
    index = make(map[int]*model.IndexPage)
)
func UpdateIndexPage() *(map[int]*model.IndexPage){

  result, err := db.Query(sqlTopPost2)
  if err != nil {
    log.Println(err)
  }
  posts := make([]*model.IndexPage, 0)

  //Run In Cycle
  for result.Next() {
    post := new(model.IndexPage)
    err := result.Scan(&post.Post.ID,&post.Post.Title,&post.Post.Description,&post.Post.Rating,&post.Post.Author,&post.Post.ImageLink)

    if err != nil{
      fmt.Println(err,"Gero")
      continue
    }

    posts = append(posts,post)

  }
  if err = result.Err(); err != nil {
    log.Println(err)

  }

  for _, post := range posts{
    index[post.Post.ID] = post
  }

  return &index

}

The error crashes on the line result.Scan

Answer 1

It was all about structure. Instead of

type Data strcut {
 Dt      *Img
}
type Img strcut {
 Link  string
}
использовать 
type Data strcut {
 Img
}

Answer 2

Where do you create the index variable that the function returns? And it will be easier if you specify the line that the error points to