FROM THE DEVEOPERS:
Update botania to 402+. This crash is fixed there. Please do not submit duplicate issues or bump this one.

Well, This is very silly and a me problem but I thought of posting here.
Step one, Place four Thermalilys next to a mana pool and a spreader a few blocks above.
Step Two, Bind them all nice and cozy.
Final Step, Feed them hungry mana generating flora some fancy Coal Coke four one for each n.n

And Voila the result is having to go to MC edit or something and probably remove the whole setup cause I cannot enter the world anymore : D
Its totally my fault but I thought sharing.
https://gist.github.com/NikGold/1f91ddf766cb2efee66773d85be8506a

For now downgrade Forge to build 106, Willie will probably push the fix later today.

This is caused by Forge moving the spot adding renderers to the vanilla list, while we were adding it in a spot that wasn't really supposed to be used for it. There is a check for all the renderers being present but it doesn't actually crash the game, just puts a message into the console log.

actually I figured out that problem is "Just enough items". When i add this mod client crashes

@Sebulba13 That sounds either like an unrelated issue or #3387, not this

I'm not an expert but this happens only when mana is getting from mana spreader to mana pool. So maybe "just enough items" cant see mana as actual object like water or oil

@Sebulba13 post the crash report instead of speculating, please