php - Error in updating database table and fetching appropriate row using mysqli_fetch

I am trying to send login information to this php script and update certain fields in the database if the username and password exists. But I'm getting an error with mysqli_fetch_array. There are a lot of similar questions here already and I know that the problem is with "$result"(when I print out the value of result it is 1), probably because of the query failure ! But when I execute just the query in mysql it updates the fields without any problem so I'm really clueless. Would really appreciate any help !
Thank you.

This is the php code :

if(isset($_POST) == true && empty($_POST) == false){
    $latitude = $_POST['Latitude'];
    $longitude = $_POST['Longitude'];
    $timestamp = $_POST['Timestamp'];
        $Password=$_POST['Password'];   
        $name=$_POST['userName'];


    $dbname = "android_db";

    $servername = "localhost";
    $username = "root";
    $password = "1234";

    //connect to the database
    $conn = mysqli_connect($servername, $username, $password, $dbname);
    if(!$conn)
    {
        die("Connection Failed" . mysqli_error($conn));
    }

$sql = "Update LocationTable SET Latitude='$latitude', Longitude='$longitude' WHERE name='$name' AND Password='$Password';";

$result = mysqli_query($conn, $sql);
echo"$result";

$response = array();

while($row = mysqli_fetch_array($result)){
    $response = array("id"=>$row[0],"name"=>$row[1],"password"=>$row[2],"email"=>$row[3]);
}


echo json_encode(array("user_data"=>$response));
 }
?>

This is the output:

1


Warning:  mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in
/opt/lampp/htdocs/friendFinder/login.php on line
28

{"user_data":[]}

These are the fields in the database table

Answer

if(isset($_POST) == true && empty($_POST) == false){
    $latitude = $_POST['Latitude'];
    $longitude = $_POST['Longitude'];
    $timestamp = $_POST['Timestamp'];
        $Password=$_POST['Password'];   
        $name=$_POST['userName'];


    $dbname = "android_db";

    $servername = "localhost";
    $username = "root";
    $password = "1234";

    //connect to the database
    $conn = mysqli_connect($servername, $username, $password, $dbname);
    if(!$conn)
    {
        die("Connection Failed" . mysqli_error($conn));
    }

$sql = "Update LocationTable SET Latitude='$latitude', Longitude='$longitude' WHERE name='$name' AND Password='$Password';";

$result1 = mysqli_query($conn, $sql); // update action

$result = mysqli_query($conn, "select *from LocationTable"); // fetch action


$response = array();

while($row = mysqli_fetch_array($result)){

    $response = array("id"=>$row[0],"name"=>$row[1],"password"=>$row[2],"email"=>$row[3]);
}

echo json_encode(array("user_data"=>$response));
 }
?>