Version 1.15.2
When standing on lava in a lava pond(overworld), after a while the game will crash. Don't know if this is do to the player holding an item(I had a stick in my hand) or if this is because the action of trying to spawn the solidified lava is happening too quickly.
Crash Report

You have so many mods, I can't repro this with only Vulcanite

There's some kind of mod that let you walk on lava?

I can try on another build and see if I still get the error.

I have a couple of enchantment mods and I think one of them offers the lava walker enchantment.

Should be fixed in 2.1 2

Found the mod causing this in case you want to look into it further.
Crash Report