Mysqli - how to fix error with bind_param?

Question

PHP

$q="Проверка";
$query = $link->prepare("SELECT id, name FROM cities WHERE name LIKE CONCAT(?,'%')");
$query->bind_param('s',$q);
$query->execute();
$res = $query->get_result();

Gives an error: "Fatal error: Call to a member function bind_param() on a non-object"
The error, respectively, points to the line with bind_param...
Request

SELECT id, name
FROM cities
WHERE name LIKE CONCAT( 'Мос', '%' )

Through phpMyAdmin it works correctly.
Throw out bind and pass an array with the value in$query->execute(array($q));

$query = $link->prepare("SELECT id, name FROM cities WHERE name LIKE CONCAT('?','%')");
//$query->bind_param('s',$q);
//$query->execute();
$query->execute(array($q));
$res = $query->get_result();

doesn't help, gives error
Fatal error: Call to a member function execute() on a non-
object

Answer 1

Before connecting to mysqli, we write a magic line
and find out what the problem was with our request

Answer 2

try to write like this, $query->execute($q);

Answer 3

Your variable is most likely false, not an object as you would expect: www.php.net/manual/en/mysqli.prepare.php . And false has no methods.