I got an Image-Slider in a website and in the Console, there is the following Error-Message:

Uncaught TypeError: Cannot read properties of undefined (reading 'style') at showSlides (Script.js:64) at Script.js:40

showSlides @ Script.js:64, (anonymous) @ Script.js:40

The Error dosent affect the slider in any way, but i want to fix it.

JavaScript Code:

var slideIndex = 1;
showSlides(slideIndex);

// Next / Previous controls
function plusSlides(n) {
  showSlides(slideIndex += n);
}

// Thumbnail image controls
function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("sliderImage");
  var dots = document.getElementsByClassName("imageSliderDot");
  if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";
  dots[slideIndex-1].className += " active";
}