The mod Pipette Ghost Builder (2.0.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event hover_ghost_builder::on_player_pipette (ID 108)
Invalid plan. Inventory positions for {superconductor, rare} is empty.
stack traceback:
[C]: in function 'newindex'
__hover_ghost_builder/modules/fill_request_proxies.lua:66: in function 'fill_request_proxy'
hover_ghost_builder/modules/fill_request_proxies.lua:93: in function 'fill_request_proxies'
hover_ghost_builder/control.lua:42: in function <hover_ghost_builder/control.lua:31>

Maybe a construction bot tried to pick up the item at the same time, or maybe something about it being an item requested for an inventory slot?