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1. Minecraft version: 1.12.2
2. Galacticraft version: GalacticraftCore-1.12.2-4.0.2.280
3. GalaxySpace version: GalaxySpace-1.12.2-2.0.14
4. AsmodeusCore version (for 2.0.1 version and above): AsmodeusCore-1.12.2-0.0.18
5. Side (Single player (SSP), Multiplayer (SMP), or SSP opened to LAN (LAN)): Server
6. Other add-ons:

• ExtraPlanets-1.12.2-0.7.0
• GalacticTweaks-1.1.0
• GalacticraftTweaker-1.12.2-1.0.3
• PlanetProgression-1.12.2-0.4.5

Description of the issue:
Random crash while exploring the moon IO on a server

Screenshot/Video:

Attached log file (or url on pastebin.com):
https://gist.github.com/knoxhack/a44277b89c32e1c396b3597978986fe3

Try 2.0.15

Same issue: https://pastebin.com/q5W2jSxT

Was fine at first, this time I had the compass out looking for a dungeon, flying over terrain I had already mapped, game has crashed 8x so far (full shutdown & relaunch required)

IO is a mess of corrupted chunks

Same issue: https://pastebin.com/kwgRJAXw

First i could explore IO without problem.

Now it crash frequently.
It started the second time i went to IO.

After several reconnects it works but only if i go in the opposite direction.

Maybe it helps to find the issue.

Once you get stuck in a chunk, getting out can be troublesome. Sometimes you get lucky and find your dungeon before the server explodes ;P