The bug only appears when I am crafting or moving objects in the Inventory (E). I have unnistalled various CoreMods but I dont find the issue. There`'s the log.
In reply to zackysh:
It looks like it might be Optifine
I have changed Opt. ver. to an older and It's solved, thank u :) But now... It consumes 40% more ram xD I think 1.12.2 with 100+ mods requires more than 8 gb ram