Factorio Forums

This mod seems to work. However, in multiplayer, on saving with it, then trying to reload, it fails to load, freezing with a generic error message.

hmm... Those are simple number alterations with all-vanilla items and no fancy tricks.
If changing nil to 1 won't help here: I'd say it is valid reason to go pester devs in bugreports.

There is also factorio-current.log file in the factorio folder, it may contain a bit more information on the reasons of crash.