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次のコードがあります。

/* Select the latest 10 posts from users this person's following */
$stmt = $cxn->prepare('SELECT * FROM posts WHERE user_id IN (SELECT following_id FROM follows WHERE user_id = ?) ORDER BY datetime DESC LIMIT 15');
$stmt->bind_param('i', $user_id);
$stmt->execute();
$result = $stmt->get_result();

/* If a result exists, continue. */
if ($result->num_rows) {
    while ($row = $result->fetch_assoc()) {
        $stmt = $cxn->prepare('SELECT username FROM users WHERE user_id = ?');
        $stmt->bind_param('i', $row['user_id']);
        $stmt->execute();
        $stmt->bind_result($username);
        $stmt->fetch();
    }
}

問題は、2 番目のクエリの bind_param 行で次のエラーが発生することです。

Fatal error: Call to a member function bind_param() on a non-object on line $stmt->bind_param('i', $row['user_id']);

どうしたの?助けてください!

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