Can generate error when using !postmap on a non-mindustry-discord server

[Arkanic]

Using !postmap on a discord server that isn't a mindustry official one (in this case #social) generates an error

[Anuken]

CoreBot has no support for other servers, everything is hard-coded to use Mindustry's. It cannot be invited anywhere else. Any instances running somewhere else are forks with modified code; I am not responsible for them.

It's also worth noting that the stack trace shown contains very outdated code.