Hi, I was playing the mod Exotic Space Industry: Remembrance with my friends earlier and the mod author implemented a custom beacon using your mod. We found that in multiplayer if someone try to rotate the custom beacon with asymmetric fluid connection (including its ghost) will cause a non-recoverable error.
My thread under Exotic Space Industry: Remembrance:
https://mods.factorio.com/mod/exotic-space-industries-remembrance/discussion/688b93b961f1e68efca649ad

The error code I get:

The mod Nonstandard Beacons (1.3.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event zzz-nonstandard-beacons::nsb-beacon-rotate (ID 226)
zzz-nonstandard-beacons/control.lua:394: attempt to index field '?' (a nil value)
stack traceback:
zzz-nonstandard-beacons/control.lua:394: in function <zzz-nonstandard-beacons/control.lua:385>

Is this happening in remote view or normal? I can't seem to reproduce in my version but I've made other changes, let me know if it still happens once the update goes out.

Disregard, error found. Fixing for next release

Working properly now, thanks!