Relayed from: EnigmaticaModpacks/Enigmatica6#1205

Describe the bug
Entity known as Mimicube attacked me, presumably tried to transform in to me and is now causing a crash loop.
Effects at the time were levitation from a Shulker
Equipped items to my knowledge were a full set of unenchanted Archmage robes from Ars Nouveau, the Archmage book from the same mod, a DANK, and a diamond sword with 5% chance to set something on fire from Apotheosis and an umbrella from some mod with a name that escapes me.
Upon trying to rejoin the world it goes: Joining Server, Encrypting, Loading Terrain, Saving World, Crash to Launcher with error

Friend of mine told me, after reading my crash report, the umbrella cannot be equipped by the Mimicube after it copies my gear. So from what we can see that would be the reasoning for crashing upon loading.

Logs
https://pastebin.com/3K2VNPpH

Thanks for the report! I've released a patch that fixes the issue.

Damn that was quick, thank you!