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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)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
__base__/lualib/npe/helper-branches.lua:1179: in function 'action'
__core__/lualib/story_2.lua:192: in function 'update'
__base__/lualib/npe/helper_story.lua:40: in function '?'
__base__/lualib/event_handler.lua:7: in function <__base__/lualib/event_handler.lua:4>
stack traceback:
[C]: in function '__index'
__base__/lualib/npe/helper-branches.lua:1179: in function 'action'
__core__/lualib/story_2.lua:192: in function 'update'
__base__/lualib/npe/helper_story.lua:40: in function '?'
__base__/lualib/event_handler.lua:7: in function <__base__/lualib/event_handler.lua:4>

Duplicate of 74041, and already fixed.
Thanks for the report anyway!