Just looking at the crash report, my guess is some kind of feedback loop? Seems like they tried to connect the flux point directly to an Actually Additions laser relay.

https://gist.github.com/xAlicatt/bedf3b34118821e0c9bc2f39179d1c24

Is that still reproduced?

I haven't been playing with a pack with Flux Networks in a very long time, so I cannot answer this for absolute sure...but I'm like 90% sure that it was fixed in an update later on and/or it was caused by another mod.

Closing: Hasn't cropped up since, probably Actually Additions related issue.