The mod GhostBuster (0.2.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event GhostBuster::on_built_entity (ID 6)
GhostBuster/control.lua:72: attempt to index local 'ent' (a nil value)
stack traceback:
GhostBuster/control.lua:72: in function <GhostBuster/control.lua:31>
(...tail calls...)
GhostBuster/control.lua:210: in function 'check_ghost'
GhostBuster/control.lua:220: in function <GhostBuster/control.lua:220>

I do have a few other mods installed - let me know if you need more details.
(Edit: The only entity from a mod which GhostBuster was attempting to revive when the crash occurred was a
miniloader (https://mods.factorio.com/mod/miniloader) - all other entities were vanilla)