Crashes when combinator receives a network signal.

Error while running event crafting_combinator::on_tick (ID 0)
crafting_combinator/script/signals.lua:127: attempt to index field 'highest_present' (a nil value)
stack traceback:
crafting_combinator/script/signals.lua:127: in function 'get_highest'
crafting_combinator/script/recipe-selector.lua:8: in function 'get_recipe'
crafting_combinator/script/cc.lua:306: in function 'set_recipe'
crafting_combinator/script/cc.lua:187: in function 'update'
crafting_combinator/control.lua:103: in function 'run_update'
crafting_combinator/control.lua:113: in function <crafting_combinator/control.lua:105>

del

I think I fixed this in 0.15.2 just now, though I'm not completely sure if it was the same issue, so it'd be nice if you could give it a go and see if it's actually fixed.

Edit: What's that del about?

"del" was about "bug only appears if combinator was placed by bots", but it is not true

Ah ok. The one I fixed only happened when you save/loaded after building a combinator, but before sending any signals to it.