在T352501#9375007中，@Diskdance写道：

This is caused by an on-wiki gadget: https://zh.wikipedia.org/w/index.php?title=MediaWiki%3AGadget-VariantAlly.js&diff=79927662&oldid=79892477

@Jdlrobson's edit fixed it throwing exception but caused it to return undefined, causing more breakage.

As the maintainer of the gadget I suggest change line 140:

} catch (e) {
	return; // <-- here
}

into:

} catch (e) {
	return link;
}

and link 213:

var anchor_1 = target.closest('a');

into

var anchor_1 = target.closest('a[href]');