bug caused when playing rampant version 3.2.0
evolution factor is 0.6896. time 12%, pollution 41%, spawner kills 47%
rampant was added at the start of the game

game crashes, playing multiplayer with mods, mainly K2 and some smaller stuff, while doing some expansion if that matters
upon death of a biter or base the following occurs
The mod Rampant (3.2.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Rampant::on_tick (ID 0)
Rampant/libs/BaseUtils.lua:408: attempt to index local 'base' (a nil value)
stack traceback:
Rampant/libs/BaseUtils.lua:408: in function 'canMigrate'
Rampant/libs/Processor.lua:385: in function 'processVengence'
Rampant/control.lua:992: in function <Rampant/control.lua:971>

mod list
-alien Biomes 0.6.8
-armoured biters 1.1.6
-atomic artillery 0.2.3
-caramelldansen labs 1.0.2
-factorio library 0.12.6
-FNEI 0.4.1
-king jo's ford mustang 1.1.4
-king jo's fuel 1.1.1
-Krastorio 2 1.3.18
-Krastorio 2 assets 1.2.1
-Rampant 3.2.0
-Squeak Through 1.8.2
-the ruins mod 1.1.6
-vehicleSnap 1.18.5

do you have a save you are willing to share? if so, you can upload to the forums. https://forums.factorio.com/viewtopic.php?f=94&t=31445

i sure do, but my post is waiting for mod approval, it's basically word for word what i posted above with the save attached

Thanks for the report and save, this should be fixed in the latest