[wheybags][0.17.4] crash on 'spawn_attack_wave' in tutorial

[Chicking]

• What did you do?
  I tried to block biter spawnpoint with walls and furnaces.
• What happened?
  The scenario crashed:

  Code: Select all

  Error while running event level::on_tick (ID 0)
  position not specified.
  stack traceback:
  	__base__/lualib/attacks.lua:155: in function 'spawn_attack_wave'
  	__base__/lualib/attacks.lua:226: in function 'check_spawn_wave'
  	__base__/lualib/npe/story-update.lua:63: in function 'update'
  	...m/steamapps/common/Factorio/data/core/lualib/story_2.lua:188: in function 'update'
  	__base__/lualib/npe/storytable.lua:119: in function '?'
  	__base__/lualib/event_handler.lua:7: in function <__base__/lualib/event_handler.lua:4>
  stack traceback:
  	[C]: in function 'create_entity'
  	__base__/lualib/attacks.lua:155: in function 'spawn_attack_wave'
  	__base__/lualib/attacks.lua:226: in function 'check_spawn_wave'
  	__base__/lualib/npe/story-update.lua:63: in function 'update'
  	...m/steamapps/common/Factorio/data/core/lualib/story_2.lua:188: in function 'update'
  	__base__/lualib/npe/storytable.lua:119: in function '?'
  	__base__/lualib/event_handler.lua:7: in function <__base__/lualib/event_handler.lua:4

• What did you expect to happen instead?
  I thought biters would either spawn in the closest free tile (and I wanted to force an army of biters to spawn on the unreachable cliffs), or not spawn at all.

Steps to reproduce:
Load the attached savefile, wait 3 seconds, crash.

[wheybags]

I can't help but feel this is a bit of a "stop hitting yourself" kind of situation, but regardless...
fixed for the next version :p

[Ramisaa]

Had similar thing happen to me on the demo version. Though I got a different error message. Oh and I pretty much built a great wall to direct the spawning in a certain location or to not spawn at all and it crashed. This bug/crash happened on the recent demo download version - 0.17.79 (demo, stable).

Code: Select all

The scenario level caused a non-recoverable error.
Please report this error to the scenario author.

Error while running event level::on_tick (ID 0)
position not specified.
stack traceback:
	__base__/lualib/colony_controller.lua:140: in function 'find_biter_for_reinforcement'
	__base__/lualib/colony_controller.lua:166: in function 'check_colony_for_reinforcement_requirements'
	__base__/lualib/colony_controller.lua:478: in function '?'
	__base__/lualib/event_handler.lua:7: in function <__base__/lualib/event_handler.lua:4>
stack traceback:
	[C]: in function 'create_entity'
	__base__/lualib/colony_controller.lua:140: in function 'find_biter_for_reinforcement'
	__base__/lualib/colony_controller.lua:166: in function 'check_colony_for_reinforcement_requirements'
	__base__/lualib/colony_controller.lua:478: in function '?'
	__base__/lualib/event_handler.lua:7: in function <__base__/lualib/event_handler.lua:4>