Kenapa tidak bisa login

kenapa saya tidak bisa login, padahal username sama passwordnya sudah benar.

<?php
session_start();

if(isset($_SESSION['login'])){
	header("Location: index.php");
	exit;
}

require 'php/koneksi.php';

if(isset($_POST['login'])){
	$username = $_POST['username'];
	$password = $_POST['password'];

	 $query =  mysqli_query($conn, "SELECT * FROM users WHERE username = '$username'");

	 if(mysqli_num_rows($query) === 1){
		 $row = mysqli_fetch_assoc($query);
	 		if(password_verify($password, $row['password'])){
	 		$_SESSION['login'] = true;
	 		$_SESSION['id_user'] = $row['id_user'];
			$_SESSION['nama'] = $row['nama'];
			$_SESSION['username'] = $row['username'];
			$_SESSION['avatar'] = $row['avatar'];
			$_SESSION['deskripsi'] = $row['deskripsi'];
	 	header("Location: index.php");
	 	exit;

	 	}

	 }

	 $loginerror = true;
}

 ?>