Error updating record: You have an error in your SQL syntax

Выдает такую ошибку

 Error updating record: You have an error in your SQL syntax;
 check the manual that corresponds to your MySQL server version for the right
 syntax to use near 'order = '3', img = 'apple.png' WHERE id = '1'' at line 1

сам код выглядит так:

function updateGoods() {
    $conn  = connect();
    $id    = $_POST['id'];
    $name  = $_POST['gname'];
    $cost  = $_POST['gcost'];
    $descr = $_POST['gdescr'];
    $order = $_POST['gorder'];
    $img   = $_POST['gimg'];
    $sql = "UPDATE goods SET name = '$name', cost = '$cost', description = '$descr', order = '$order', img = '$img' WHERE id = '$id'";
    if (mysqli_query($conn,$sql)) {
        echo "1";
    }
    else {
        echo "Error updating record: " . mysqli_error($conn);
    }
    mysqli_close($conn);
}

Почему происходит эта ошибка?