Null pointer exception when emmiting to socket

[Mcilie]

This code throws an NPE for some reason , although I dont use any null values

`
import java.awt.AWTException;
import java.awt.HeadlessException;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Base64;

import javax.imageio.ImageIO;

import org.json.JSONException;
import org.json.JSONObject;

import io.socket.*;
import io.socket.IOCallback;
public class Main{ //implements IOCallback {

/*public static byte[]  snap(String name) throws HeadlessException, AWTException, IOException{
	BufferedImage image = new Robot().createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
	ImageIO.write(image, "jpg", new File(name));
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
}*/
public static String snap() throws IOException  {

    Rectangle screen = new 
    Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
    BufferedImage screenCapture = null;
    String base64Encoded = "";

    try {

        screenCapture = new Robot().createScreenCapture(screen);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(screenCapture, "jpg", baos);
        baos.flush();
        byte[] encodedBytes = Base64.getEncoder().encode(baos.toByteArray());
        base64Encoded = new String(encodedBytes);
        baos.close();

    } catch (AWTException e) {
        e.getMessage();
    }

    return base64Encoded;
}
public static int BasicExample(String img) throws IOException {
	SocketIO socket = new SocketIO("http://127.0.0.1:5000/");
	

	// Sends a string to the server.
	

	

	// Emits an event to the server.
	socket.emit(img);
	return 3;
}
public static void main(String[] args) throws IOException, HeadlessException, AWTException {
	for (int i = 0; i<10; i++){
		
		//String name = "./ScreenShot" + Integer.toString(i) + ".jpg";
		
		//System.out.println(snap());
		 int w = BasicExample(snap());
	}
	//SocketIO socket = new SocketIO("http://127.0.0.1:5000/");
	
	
}

}`