MySQL/PHP - INSERT problems. It returns an empty result set

I've been debugging this for hours. Double-checking my table and variables carefully. But I couldn't find the problem.

$fname = $_POST['fname'];
$lname = $_POST['lname'];
$user = $_POST['user'];
$pass = $_POST['password'];
$conpass = $_POST['conpass'];

            $sql = "SELECT useame FROM account WHERE useame = '$user'";
            $result = mysqli_query($co, $sql);
            $check_user = mysqli_num_rows($result);

            if($check_user > 0){
                header("Location: ../signup.php?error=useame");
                exit();             
            }else
            {
                $encryption = password_hash($pass, PASSWORD_DEFAULT);
                $sql = "INSERT INTO account (first_name, last_name, useame, password)
                VALUES ('$fname', '$lname', '$user', '$encryption')";
                $result = mysqli_query($co, $sql); 
                if($result){
                    header("Location: ../index.php?successful");                    
                }else{
                    header("Location: ../signup.php?error=hahahah");
                    exit();
                }

            }
?>