Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in

[Nitsuga120]

Hola tengo un problema con msqli que me da error al logiarme en la pagina que hice
este es el error
Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in /home/ on line 10
y este es el codigo

Código PHP:

<?php
 
$user = $_POST['nom'];
$pass = $_POST['pas1'];
$contra = md5($pass);
$conexion = mysqli_connect("mysql.hostinger.com.ar","u550168560_mateo","mateof00","u550168560_login") or die("Error al conectar");
 
//$sql = "SELECT `id` FROM `user` WHERE `username`=='$user' AND `password`=='$pass'";
$result = mysqli_query($conexion, "SELECT `id` FROM `wisher` WHERE `username` = '".$user."' AND `password` = '".$pass."'");
if(mysqli_num_rows($result) > 0)
{
 
echo "Logueado";
 
}
else {
 
echo "Error al Loguear";
 
}
mysqli_close($conexion);
 
?>