Strange Google Crawl Issue Related to FancyBox

(Link above is an example, it is happening on all pages on the site).

I’ve noticed that Google has started crawling good URLs, then also crawling the same good URLs but with “javascript;” and “javascript” appended (without the quotes) – which is causing 404 errors.

I posted a question to Google Communities who identified it is coming from:

jQuery(this).attr(“data-fancybox”, “”).attr(“href”,”javascript;”).attr(“data-src”,href);

(see https://support.google.com/webmasters/thread/12048649?hl=en)
They also suggested something different to sort this (“I’d expect …”) but at this point it’s beyond my technical knowledge.

The page I need help with: [log in to see the link]