Pro tip: when a mod is causing crashes, first thing to do before seeking help or filing a bug report is to look for an updated version. There was an update to Forge a few months ago that required mods to update if they accessed certain parts of the potion code. You can see it was updated months ago to address it: https://github.com/TheCBProject/NotEnoughItems/commit/9f34a04f395a1c30af2eff779968210fa4be3283