Please help, weird thing with java scanner

[mellow sedge]

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[open relic]

private static int readInt() {
    while (true) {
        try {
            print(" Ingresar cantidad de alumnos: ");
            return reader.nextInt();
        } catch (InputMismatchException e) {
            System.out.println(" \u001B[31m El valor debe ser un numero entero.\u001B[0m");
        }
    }
}

private static void registerStuds(int max) {
    students = new String[max];
    grades = new double[max];
    String line;
    for (int i = 0; i < max; i++) {
        while (true) {
            try {
                print(" Ingresar Alumno: ");
                line = reader.nextLine();
                if (line.matches("[A-Za-z ]+")) {
                    students[i] = line;
                    try {
                        print(" Ingresar Nota: ");
                        grades[i] = reader.nextDouble();
                        break;
                    } catch (InputMismatchException e) {
                        println(" \u001B[31m El valor debe ser un numero decimal.\u001B[0m");
                    }
                } else {
                    println(" \u001B[31m El valor debe ser alfabetico.\u001B[0m");
                }
            } catch (NoSuchElementException e) {
                println(" \u001B" + e.getMessage() + "\u001B[0m");
            }
        }
    }
}

I don't understand why this is being triggered

That should only happen if I input something wrong

But i didn't input anything

Only the "4" in readInt()

But when it loads registerStuds() that happens

This was not happening some moments before and i don't know what could it be

And this keeps happening

Wait

Nevermind

im so dumb

I moved the reader = new Scanner(System.in); from the loop to test if it would behave normally and i forgot

aagg