Whenever I launch Minecraft with it in my mod list it crashes and I have no clue why, exit code is: 1

Visit the Discord server of whatever mod you are using that requires KFF (Cobblemon? Better Foliage? InvProfiles Next?)

But it's only KFF because I went through all my mods and it only stopped crashing when i disabled KFF

I assure you it's not (it has never been in dozens of reports), it's whatever mod you're using that depends on KFF