Environment

Factorio 0.17.34
Crafting Combinator 10.8

Reproduction

1. Let Robots build a crafting combinator (e.g. by ghost placement)
2. Press Ctrl+Z to undo and let the robots pick up the combinator.
   2.1 Observe: Where the combinator stood, there is an invisible module chest entity. You can hover over it and mine it manually.
3. With an deconstruction planner try to deconstruct the chest.
   3.1 This results in the following error:

   Error while running event crafting_combinator::on_marked_for_deconstruction (ID 20)
__crafting_combinator__/script/cc.lua:77: attempt to index a nil value
stack traceback:
__crafting_combinator__/script/cc.lua:77: in function 'mark_for_deconstruction'
__crafting_combinator__/control.lua:192: in function <__crafting_combinator__/control.lua:191>

Tests

I tested it in a minimal creative environment:
a roboport, a storage chest with crafting combinators and a bit of solar power suffice.
Enable all tech/items/daytime/cheat mode.

Not crashing

Mining the remaining module chest manually won't result in a crash.

That's interesting, the combinator entity is supposed to not be deconstructible, but undo apparently ignores that. Shouldn't be too hard to fix tho.

Should be fixed in 0.10.9.