While investigating the cause of #394 I encountered another crash. I have a minimal configuration modpack with Alex's Mobs, SecurityCraft, and Citadel (Alex's Mobs required library).

I had a camera placed in the overworld, linked to my camera controller. I used the camera, then went to the nether. I attempted to view the camera in the nether and was told the camera was unloaded. I placed a camera in the nether, linked it, and then upon trying to view the camera the server died. No crash report was generated, TPS halted, and the log started filling with errors.

Log: https://mclo.gs/Xs7bPjI

If you're interested, here's the list of mods I have in common with 394. Create does not cause problems, I tested that first, then tested Alex's Mobs and discovered this.