Issue with using array after splitTokens()

[eezJerome]

@kll

after that a split ( like for “,” ) gives a error if there is no “,”
so try a match first
if ok do the split to array.
when using the array you must check on the length of the array,
if you get 2 values, one “,” you get array length 2
but if you have com problems might get short lines,
so you check
if length >= 2 else println(“bad line”);
finally you can inside use a input[0] and input[1]

Might you show me in processing code?
I tried and this is what I got

import processing.serial.*;

Serial port;
//String[] input = {};
float val;

String[] arr_input = new String[2];

int index = 0;

void setup(){
  stroke(250);
  size(1000, 700);
  port = new Serial (this, "COM12", 115200);
  port.bufferUntil('\n');

}

void serialEvent(Serial port){
 // input = float((port.readStringUntil('\n'));
 /*input = splitTokens(*/port.readStringUntil('\n');

}

void draw(){
  String[] input = splitTokens(port.readString());
  background(1);
  arr_input= split(input[index], ',');
  index++;
  println(input[0]);
  println(input[1]);
  
  index = 0;
  port.clear();
  
}

NullPointerException