Thanks for the feedbacks guys!
I asked on the discord server of AoA3 and was told the issue was actually because I changed the keybind of the GUI of AoA3, so I changed it back to it's normal keybind and I was able to enter my world again. Thank you for helping my pinpoint the mod!
So I was playing a modpack I made for minecraft 1.12.2 yesterday normally, but when I tried playing on my existing world today my game crashed and was shown this crash:
And the show more info says: The game crashed whilst ticking memory connection
Error: java.lang.ArrayIndexOutOfBoundsException: -96
Any help would be greatly appreciated! Also if any more information is needed please let me know.