No char input to scanner creates infinite loop

I've got a strange issue (or at least strange to me). I've got a couple if-else-if statements that are causing strange behavior. For context, I'm essentially taking a char input using the Scanner class and using Scanner.nextInt().charAt(0). This appears to work fine if I check for the required characters and input a totally random character (it returns text to the terminal, breaks out, and exits). However, if I just hit enter at the char prompt, it creates what appears to be an infinite loop (maybe a memory leak?). Attached is the code I'm working on, as well as screenshots of it running in Coderunner2.

Thanks in advance!

import java.util.*;
import java.io.*;

public class phonebill 
{
    public static void main(String[] arg)
    {
        Scanner sc = new Scanner(System.in);

        System.out.print("Please input the account number: ");
        int acct = sc.nextInt(); // reads arbitrary account number
        System.out.print("Please input service code: ");
        char svc_code = sc.next().charAt(0); // reads service code 
character

    /* the following blocks check for the appropriate service codes.
     * valid codes include p or P for 'Premium' service, and 
     * r or R for regular service. if no valid code is read,
     * the program exits, informing the user to input a valid code.
     */
        if (svc_code == 'p' || svc_code == 'P')
        {
            System.out.print("Please input daytime minutes: ");
            int day_min = sc.nextInt();
            System.out.print("Please input nighttime minutes: ");
            int night_min = sc.nextInt();
            System.out.println("Service code is " + svc_code + " and this condition works.");
        }
        else if (svc_code == 'r' || svc_code == 'R')
        {
            System.out.print("Please input used minutes: ");
            int mins = sc.nextInt();
            System.out.println("Service code is " + svc_code + " and this condition works.");
        }
        else 
        {
            System.out.println("Please input a valid service code.");
        }
        System.out.print("That's all for now folks");
    }
}

Code running normally

Code being weird