Error! "headers already sent" sitemap_index.xml after update

I even get an headers modifies error on specific tag pages:

https://marctv.de/blog/tag/videos

If I disable your plugin, the error goes away. Any Idea?!

Downgraded to 1.4.7. Everything is fine now.

I’m having the same problem with 1.4.9 update. Downgraded to 1.4.7 and all is fine.

I’m running in to the same thing. Downgrading now, hopefully it fixes it.

Yep, going back to 1.4.7 fixed it.

Anyone know if 1.4.10 fixes this issue? I always prefer to keep my plugins up-to-date, but I didn’t see any mention of this in the release notes.