I thought it was worth mentioning these server-related crashes in case you have time to fix some bugs:

It all seems to be related to client stuff being forced in a server, happens a lot more often with the Flamethrower and the Biogun:

Triggered by a player on a server using a Flamethrower:
https://gist.github.com/Sereath/b7a2f713be9e45eb5784e2821b29884c

Triggered by an Outcast mob using a Flamethrower as well:
https://gist.github.com/Sereath/68f8f1c015eccd07cbb69e307f316cfd
https://gist.github.com/Sereath/16e0378f36581c3a93532294e029e0b3

And these are triggered by Outcast mobs using Bioguns:
https://gist.github.com/Sereath/e410f439bb312d4f6e2435f9f4008855
https://gist.github.com/Sereath/aa9d892ced768af126a19b0160af1aee
https://gist.github.com/Sereath/47198993f680ce7d52cbb65bc229d0cc

Doesn't seem to happen in SP, so it's hard to replicate, it eventually happens in servers and then the server gets stuck and keeps crashing until the chunk is deleted.

For now, it is being completely(?) fixed by another mod, StellarCore:
NovaEngineering-Source/StellarCore#11