php - Fatal error: Call to a member function fetch_assoc() on a non-object in (path) on line 34

I'm trying to verify some login information from a form. The security isn't that important as this is just a small social media thing for my friends and myself and I have backups so I don't really mind getting hacked, I'm just learning php.

Here is the error I'm getting:

Fatal error: Call to a member function fetch_assoc() on a non-object
in /srv/disk4/2177948/www/website.com/postlogin.php on line 34

Here is the code:
Line 34 is marked out with //

Note: The connection information is censored, it works perfectly in the script.

session_start();


$usrName = $_POST['logInName'];
$pass = $_POST['logInPass'];
$servername = "censored";
$username = "censored";
$password = "censored";
$db_name = "censored";
$conn = mysqli_connect($servername, $username, $password, $db_name);

if ($conn->connect_error) {

    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT usrName FROM loginInfo WHERE usrName='" . $usrName . "';";
$result = mysqli_query($conn,$sql);

if ($conn->query($sql) == TRUE) {
    while ($row = $result->fetch_assoc()) {
        $retrievedUsrName = $row["usrName"];
    }

} else {
    echo 'Error: ' . $conn->error;
}

$result->free;

if ($retrievedUsrName == $usrName) {
    $sql2 = "SELECT pw FROM logininfo WHERE pw='" . $pass . "';";
    $result2 = mysqli_query($conn,$sql2);


    while ($row = $result2->fetch_assoc()) { //Line 34
        $retrievedPass = $row["pw"];
    }
} else {
    echo 'Fant ikke brukernavnet i databasen. Spør Tommy.';
}

if ($retrievedPass == $pass) {
    header('Location: index.php');
} else {

    echo 'Fant ikke passordet i databasen. Spør Tommy.';
}

$result->free;

$conn->close;

?>