PHP - Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in...

function sesionAutentificacion(){

      include 'conexion.php';

      $sql = 'SELECT * FROM `usuario` WHERE `id_user`="usuario1" AND `contraseña`="U12020"';

      $query = mysqli_query($link, $sql);

      $row = mysqli_fetch_array($query);

}

function sesionAutentificacion(){

      include 'conexion.php';

      $sql = 'SELECT * FROM `usuario` WHERE `id_user`="usuario1" AND `contraseña`="U12020"';

      if ($query = mysqli_query($link, $sql)) {

            $row = mysqli_fetch_array($query);

      } else {

            echo "ERROR: ". mysqli_error($link);

      }

}