Server 500 error when using WPML

I’ve seen this issue cropped up a few years ago, and someone found a fix. It’s the last comment on this page: https://wordpress.org/support/topic/500-internal-server-error-on-wpml/

But it’s not been added to any updates. Can anyone confirm when this fix will be in place? Obviously, without it, we can’t use it.

Cheers