This happens, when ghost placer becomes active (items gone out), but then you get items delivered while placing ghost-items.
The mod There is my ghost caused a non-recoverable error.
Please report this error to the mod author.
Error while running event there-is-my-ghost::on_built_entity (ID 6)
there-is-my-ghost/events.lua:75: attempt to index field 'item' (a nil value)
stack traceback:
there-is-my-ghost/events.lua:75: in function <there-is-my-ghost/events.lua:49>
stack traceback:
GhostPlacerExpress/control.lua:87: in function <GhostPlacerExpress/control.lua:53>
stack traceback:
[C]: in function 'raise_event'
GhostPlacerExpress/control.lua:87: in function <GhostPlacerExpress/control.lua:53>