When accessing certain articles on nonbinarywiki, such as this one, I get an error message that reads [a5b64f8877c514f44e38e3c9] 2020-10-28 16:46:38: Fatal exception of type "TypeError". Happens both logged in and out, and another user is able to confirm the same error.
It was first reported to me yesterday, so maybe it's related to the MediaWiki update.