Game crashes when loading Nether Terrain.

So, in my survival world, I was linking a nether portal that leads to my end portal, it was going well as there were no issues, however, after a while of digging a tunnel to the end portal, when I entered the nether portal so I can get more resources from my base, the game suddenly crashed while loading the nether terrain. I tried moving the nether portal, that didn't work, I tried my other nether portal, it still crashed, I even tried making a brand new one, it still crashed the game. I also tried playing on vanilla 1.14.4 Minecraft, as I would usually play with Optifine, the game still crashed despite what version I played on.