Why does my code throw java.util.NoSuchElementException even though I checked hasNextInt()?

I'm doing a project for school, and my code throws java.util.NoSuchElementException at line 10 in the excerpt, even though I put TWO layers of hasNextInt (not necessary I know), so I'm not sure why it thinks there are no more elements in the string I'm scanning. I only made one scanner in the class, and somehow it says both that it has a nextInt and that it doesnt.

public String decode()
{
    Scanner scanner = new Scanner(code);
    String output = new String("");
    while (scanner.hasNextInt())
    {
        if (scanner.hasNextInt())
        {
            int digits = String.valueOf(scanner.nextInt()).length();
            if (code.indexOf(scanner.nextInt()) < key.length() - 3)
            {
                output += key.substring(scanner.nextInt());
            }
        
            else
            {
                System.out.println("key.length = " + key.length());
                System.out.println("Current index: " + key.indexOf(scanner.nextInt()));
                output += key.substring(scanner.nextInt(), scanner.nextInt() + digits);
                code = code.substring(code.indexOf(scanner.nextInt() + digits));
            }  
        }
    }
    return output;
}

public class Runner
{
    public static void main(String[] args)
    {
        SecretCode coolCode = new SecretCode("six perfect quality black jewels amazed the 
        governor", "35 10 10 33 9 24 3 17 41 8 3 20 51 16 38 44 47 32 33 10 19 38 35 28 49");
        coolCode.decode();
    }
}