MongoDB\Driver\Exception\BulkWriteException

[itsrexb]

Good day!
Has someone experience this error:
#646 MongoDB\Driver\Exception\BulkWriteException: E11000 duplicate key error collection: mydatabase.mycollection index: _id_ dup key: { : ObjectId('603ca1aafc419621b738ff82') }

I have this declared

class MyModel extends Model
{
    protected $guarded = ['_id'];

  	protected $dates = [
    	      'created_at',
    	      'updated_at',
    	      'deleted_at'
       ];
}

PHP 7.2.34
Laravel 5.8

Thank you in advance.