[issue] Hi can't find the problem in my code . I am new thanks

I was following The coding train video 7.4. link::

> 7.3: Arrays of Objects - p5.js Tutorial - YouTube

and I can’t find the problem I am facing. it says Uncaught TypeError: Cannot read property ‘move’ of undefined (sketch: line 24).
Here is my code

let bubble = [];


function setup() {
  createCanvas(600, 400);
}

function mousePressed() {
  let r = random(10, 50);
  let b = new Bubble(mouseX, mouseY, r);
  bubble[0] = b;

}

function draw() {
  background(140, 140, 20);
  for (i = 0; i <= bubble.length; i++) {
    bubble[i].move();
    bubble[i].show();
  }
}

class Bubble {
  constructor(x, y, r) {
    this.x = x;
    this.y = y;
    this.r = r;
  }
  move() {
    this.x = this.x + random(-5, 5);
    this.y = this.y + random(-5, 5);
  }
  show() {
    stroke(255);
    strokeWeight(1);
    fill(15, 94, 156);
    ellipse(this.x, this.y, this.r);
  }
}
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