[SDPhantom]

The default UI tends to taint itself a lot. When taint happens, the game engine always assumes it's from an addon and only stores an index number to tell which one. I don't know the game engine's code, but let's say when the default UI taints itself, this index gets set to 0. When the game gets to displaying an error about it, there is no addon at index 0, so to prevent a crash, it picks index 1, which is the top addon in the addon list when you look at it in the character select screen.