Rocket.Chat Version: 0.54.0

I see this in the console log of Chromium:

Invalid 'X-Frame-Options' header encountered when loading 'https://chat.k0nsl.org/livechat': 'ALLOW-FROM https://k0nsl.org' is not a recognized directive. The header will be ignored.

I have correctly filled Livechat allowed domains with the appropriate value. I'm just throwing this out there in case it hasn't been caught already.