When i log in with the newest chisel version (MC1.10.2-0.0.11.25) i get the attached crash. Downgrading to MC1.10.2-0.0.10.22 fixes the problem.

Forge 12.18.3.2316, custom modpack, local single player.

crash-2017-06-16_23.03.40-client.txt

You have optifine installed, please reproduce without it.

Yes, it seems to be an optifine interaction bug.

We do try to maintain OF compatibility, but that can only go so far. Try disabling some settings in OF to see if it's a particular one causing the issue. If you can't isolate it (or even if you can), report it to them.