How to get same values for merge cells? laravel import

I have a problem encounter, in which Laravel import returns null for merge cells.

Here is my code (I tried collection also but same it returns null):

public function model(array $row)
{
    dump($row[0]);
}

Here is my excel file look like (2-A to 11-A are merged)

When I try to dump it returns null for other rows.