How to solve looping of multiple-line reading while breaking Scanner in Java?

Question

Im trying to read multiple lines from console. I don't know the number of lines and it may differ. I know only that each line contains 2 numbers and space between them. But when I try to read them, scanner always expects a new line after I break it. I tried using .hasNextLine() and if (line.isEmpty()) conditions and other variants that I had found, but always had the same result. Part of code:

Scanner s = new Scanner(System.in);
HashMap<Integer, Integer> numberPairs = new HashMap<>();
String line;
while(s.hasNextLine()) {
    line = s.nextLine();
    if (line.isEmpty()) {
       break;
    } else {
       int[] numbers = parseLine(line);
       if (numbers != null) {
           numberPairs.put(numbers[0], numbers[1]);
       }
    }
}

Though, it was working when code was looking this way (but it was processing only second line from 2 lines I had entered):

Scanner s = new Scanner(System.in);
HashMap<Integer, Integer> numberPairs = new HashMap<>();
while(s.hasNextLine()) {
    if (s.nextLine().isEmpty()) {
       break;
    } else {
       int[] numbers = parseLine(s.nextLine());
       if (numbers != null) {
           numberPairs.put(numbers[0], numbers[1]);
       }
    }
}

Where could be the issue and how to solve it?