Hi, I crashed when trying to place a belt ontop of a belt blueprint,
https://imgur.com/a/AeWIhSQ

18028.365 Error MainLoop.cpp:1143: Exception at tick 863682: 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/functions.lua:281: attempt to index global 'new_entity' (a nil value)
stack traceback:
there-is-my-ghost/functions.lua:281: in function 'restore_stored_entity'
there-is-my-ghost/functions.lua:260: in function 'restore_stored_entities'
there-is-my-ghost/events.lua:75: in function <there-is-my-ghost/events.lua:54
18028.365 Error ServerMultiplayerManager.cpp:92: MultiplayerManager failed: "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/functions.lua:281: attempt to index global 'new_entity' (a nil value)
stack traceback:
there-is-my-ghost/functions.lua:281: in function 'restore_stored_entity'
there-is-my-ghost/functions.lua:260: in function 'restore_stored_entities'
there-is-my-ghost/events.lua:75: in function <there-is-my-ghost/events.lua:54>

Edit: Another one: https://imgur.com/a/cWdmelQ This time I placed a inserter with the wrong direction ontop of a blueprint..

Were you using other mods, can you send me the save in which it happened? As I can't seem to replicate the error as of yet

I got the same error, while drag-placing belts over ghost belts, and accidentally hitting a ghost underground belt. Funny thing is that the mod isn't even enabled in the toolbar menu.
https://imgur.com/a/P9Rbj8c
The tile where the two miners to the left of the error window would output their ore was a underground ghost.

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/functions.lua:281: attempt to index global 'new_entity' (a nil value)
stack traceback:
there-is-my-ghost/functions.lua:281: in function 'restore_stored_entity'
there-is-my-ghost/functions.lua:260: in function 'restore_stored_entities'
there-is-my-ghost/events.lua:75: in function <there-is-my-ghost/events.lua:54>

Aha, but then the error makes more sense. Just doesn't make sense that the mod is doing stuff whilest not active. At least I have something to work with