Tried to destroy world that hadn't been created!

[sgqwonkian]

Another error that comes up in the Mod I'm currently debugging is this:

ERROR: Tried to destroy world that hadn't been created!

As far as I can recall (I've been away from modding for months now) there's nothing in this mod that destroys planets. Well, other than Kawangi and supernova from the main game. But it's generating this error message when I'm just sitting on the pregame screen with ships blowing each other up - I'm not even playing yet.

Anyone know why such an error is showing up? Is it something I've done? Is there something I can do to make it stop doing that?