Hi,
No need for a video. I saw the issue with my own eyes on your website.
The javascript error is now gone. So that's good.
There is now a second problem.
You have the code:
<script type="text/javascript">
if (top!==self) {
top.location=location;
}
</script>
added at the end of your pages.
This code generates the issue by redirecting the whole page to the page inside the popup each time a popup is displayed.
So the problem is not in HikaShop.
You'll have to remove the stuff which is adding that code on your website. As far as I know, another user previously reported that the extension AntiCopy was doing that.