devRant's error messages can get very descriptive too...

Congratulation ! You have find the easter egg XD

Can you provide some steps so we can attempt to fix this? I've never seen this before.

@dfox I tried to, but unfortunately I couldn't manage to reproduce it. I know I was editing the tags of the post that can be seen in the background, and the internet connection was extremely bad at that time. I assume that had something to do with that.
Sorry :/

@Minzkraut thanks, I might have an idea of what it is.

@dfox keep me updated on this, I'm really curious