Describe the crash
I was changing my controls in the controls menu in the main menu of the game (before I have even had a chance of loading
up a world), and then my game crashed suddenly. It says that Fullscreen Windowed is a potential cause, but I wasn't even in
fullscreen. And reloading the game doesn't fix the issue, cause as soon as the main menu loads it immediately crashes again.
Pressing the Back to title screen button doesn't work since it crashes immediately as well.

To Reproduce
Since as in the description, I was in the keybinds menu changing the controls around (only the hotbar controls), and it then
suddenly crashed. I don't know how I could reproduce it if my game was suddenly fixed.

Crash Log
Clicking Get Link doesn't work and instead greys out the button with the text [Failed].

Here is a pastebin link to the original crash that happened first (the other newer ones are from clicking the back to main 
menu button).
https://pastebin.com/i4iZtn4Q

Info (please complete the following information):

• Modpack Version: 2.77.5
• Server or Singleplayer: N/A - I wasn't ingame, I was in the main menu.
• Version the world was created on: N/A ^^^^

Additional context
I have nothing else to say other than what is described above. I will be going to bed now and checking for any responses in
the morning.

Does it work on a restart/reinstall?

I figured that since I was changing controls in the keybinds menu, I should delete my settings folder to see if that would stop the issue. It seems to have stopped! I made a copy of my options.txt instead of deletion, and I am going to compare and test to see if I can recreate the issue. I'll be back on that when I find out.

Have you recreated the issue yet @Dylsnake?

@Dylsnake

Closing due to inactivity.