Image editing popup error for site upgrade to 5.1.3 after 1/27/2025

-- HikaShop version -- : 5.1.3 (after 1/27/2025)
-- Joomla version -- : 4.4.10
-- PHP version -- : 8.2.27
-- Browser(s) name and version -- : any
-- Error-message(debug-mod must be tuned on) -- : 404 or 403

When editing a product and clicking on an image to update its alt/title text, clicking on the image produces a forbidden or found error.

The link on hover looks right and opens correctly if you open it in a new tab.
i.e. /administrator/index.php?option=com_hikashop&ctrl=product&task=selectimage&cid=141&pid=1&product_type=product&tmpl=component

However, if you look at the error's URL in the javascript popup, it is:
/administrator/null&product_type=product

I guess that something in the JavaScript is causing it to open up the wrong URL.

If you add an image, it is fine. It is only when you go to edit an existing image.

However, this only happens on sites I've updated AFTER Jan. 27, 2025.

I have a copy of 5.1.3 from January 27th, 2025, that I can upload; it fixes the issue of any of the sites impacted.

Anything after that date, however, has this issue. I tried newer versions from the last couple of days, and it's still happening.

Tried this on different sites, different servers, networks, templates, and different browsers.