Upon loading chunks in the world I encounter a crash. FoamFix has intercepted the crash and reckons that OpenTerrainGenerator caused the issue, but I have been playing my modded game fine until I added Armory Expansion. Removing Armory Expansion resolves the problem, but it would be nice if the issue could be fixed.

Crashlog:
crash-2018-06-28_09.03.29-server.txt

I honestly have no clue why this would happen, Armory Expansion adds nothing that could cause this :(

I really wanted to play with this mod alongside my other mods, so I went ahead and did the old binary search method, enabling half the mods and seeing if it crashed.

I have actually found the real cause of the crash - PlusTiC. I have no idea why.
https://minecraft.curseforge.com/projects/plustic

The crashlog remains the same, but omitting PlusTiC makes the system happy again.

I haven't updated in a long time, so I might go ahead and update these two mods and try it again...