Mobile Factory is cool...
Biter Hunt Group is cool...
together they are HOT!

but... if during a hunt event the biters come at you and you enter your Mobile Factory, switching surface, the game will crash with this error:

"The mod Biter Hunt Group (18.0.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event biter_hunt_group::on_tick (ID 0)
LuaEntity belongs to surface mfSurfaceValkyrieVerci (index 2) but a LuaEntity belonging to surface nauvis (index 1) was expected.
stack traceback:
biter_hunt_group/scripts/packs.lua:372: in function 'CommandEnemies'
biter_hunt_group/scripts/packs.lua:145: in function '?'
biter_hunt_group/utility/event-scheduler.lua:84: in function <biter_hunt_group/utility/event-scheduler.lua:74>
stack traceback:
[C]: in function 'set_command'
biter_hunt_group/scripts/packs.lua:372: in function 'CommandEnemies'
biter_hunt_group/scripts/packs.lua:145: in function '?'
biter_hunt_group/utility/event-scheduler.lua:84: in function <biter_hunt_group/utility/event-scheduler.lua:74>"

this also happens in Factorissimo2 and Space Exploration and other surface change mods where you change surface mid hunt.

can you add an option as well as a check box where you can specify that biter hunts can only occur on Nauvis for server hosts that want to feature sanctuary layers?

additionally there may be need for a few other modifications so that spawn attempts can hang and (schedule) wait for a player to return to Nauvis as well as cancel their AI if they leave mid hunt.

LOVE THIS MOD! Hope you can expand on it in the future.

Will look at the error now while updating to Factorio 1.1
Added the below 2 feature requests to the todo list. I'm not activity working on this mod, but if I do I will look at both the below with the rest of the todo list:
- mod options for whitelist and blacklist surfaces where biters can appear. Not blacklisted surfaces, if whitelisted then only them, otherwise all non blacklisted.
- handle if the player leaves a surface mid hunt - send them rampaging towards spawn, but don't declare it a win.