Error opening fancybox window?

Question

JavaScript

There is a site

When opening a modal window, opening any product and some clicks inside it (for example, drop-down tabs), this kind of error occurs and is added with each click.



jquery.fancybox.js:4594 Uncaught TypeError: instance.current.$content.find(...).addBack is not a

function

// Check where is clicked
    if ($target.is(".fancybox-bg,.fancybox-inner,.fancybox-outer,.fancybox-container")) {
      where = "Outside";
    } else if ($target.is(".fancybox-slide")) {
      where = "Slide";
    } else if (
      instance.current.$content &&
      instance.current.$content
      .find($target)
      .addBack()
      .filter($target).length
    ) {
      where = "Content";
    } else {
      return;
    }

more specifically on .addBack()