The mod Laser Fence (2.0.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event laserfence::on_script_trigger_effect (ID 169)
laserfence/control.lua:172: attempt to index local 'entityOrPlayer' (a nil value)
stack traceback:
laserfence/control.lua:172: in function 'safeDamage'
laserfence/control.lua:166: in function <laserfence/control.lua:158>

I've been playing with it for hours without an issue and it just crashed. It seems to have been caused by a destroyer drone on the enemy team, that or fire or acid or a tree... Yes I am playing with that tree mod but it hasn't crashed once until now so I'm not sure what cause this error.

Same Error here.
Happened the first time a bunch of biters attacked a fence. Maybe on its destruction?
Major mods are the Space Age DLC and Krastorio Spaced Out.

Same, literally unusable this way if it crashes every 10mins in rampant