when I picked up lava with an iron bucket on 1.9 the game crashed
https://paste.ee/p/OXsmb

Can't seem reproduce this one, does this occur with just BoP?

no I had more mods as you can see in the log

but I tought it was more related to BoP because of this line
at biomesoplenty.common.handler.BucketEventHandler.onRightClickHoldingBucket(BucketEventHandler.java:36

Yes I am aware, hence the question. The lines in the stacktrace don't necessarily always mean the mod at the top is at fault. Does removing blood magic fix the issue?

I'll test without Blood Magic

but maybe it is also related to BloodMagic
https://paste.ee/p/g6NX0

still crashes https://paste.ee/p/gIvCV

Back to my original comment though, does it occur with just BoP? It might just need to be a process of elimination to determine which mod is causing troubles

I will try to disable mod by mod to check if any mod is causing the issue
I already disabled only BoP and it worked fine

it's a little weird!! It looks like it only happens in that world

ok I found out
It only happens when you are not close enough to the lava source to be able to pick it up
I remember that in 1.7.10 sometimes I tried to pickup lava but was too far away and the bucket looked like it filled in however it didn't. but here instead of just a visual bug it instantly crashes
I hope you can understand this

Ah okay, yeah, I can reproduce that, i'll fix it in a bit