Creating new world/loading old worlds crash Minecraft

Minecraft was working fine yesterday (date: 18/8/2018), however launching it up today (today's date: 19/8/2018) and all seemed fine the launcher opened and launched the game. However I noticed that upon clicking on multiplayer (regardless of how many times i refreshed or restarted minecraft) servers were coming up as "Cannot connect to server" (I just assumed that my internet connection was being silly, so I have no idea if this is related to my issue or if its a separate issue. Though all my other programs seem to function just fine), so I decided to play some singleplayer. Clicked on a world and sat through the world loading/generating, however not long after it reached 100% the game crashed. (This actually happened in 1.12.2 first, and i decided to go into 1.13 to see if the issue persisted)

Reproduce:

1. Launch Minecraft

2. Select either verison (1.13 or 1.13.1-pre1)

3. Click on singleplayer

4. Either create a new world or load an already existing world

5. Game should go through the loading/generating world thing

6. it should get to 100% and crash resulting in the attached crash report

If it can't be reproduced on your machine, then I don't exactly know why mine is broken. I have fully uninstalled and re-installed Minecraft and the issue is still present. I haven't deleted anything of importance on the computer, the only things I would've deleted are broken registry items and other stuff Avast Cleanup finds. However this hasn't caused this issue before, so I don't see why it would now.

Let me know if more information is needed, because I'd gladly get a hold of what i can.