Added this to an existing game. Attempted to fire an Ion Cannon (https://mods.factorio.com/mod/Kux-OrbitalIonCannon), game crashed after firing.
The mod Enemy Race Manager (2.0.3) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event enemyracemanager::on_trigger_created_entity (ID 25)
...yracemanager__/controllers/on_trigger_created_entity.lua:35: attempt to index local 'source' (a nil value)
stack traceback:
...yracemanager__/controllers/on_trigger_created_entity.lua:35: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>