https://mclo.gs/XOktYgK

Load Minecraft with Essential Mod and Show Me Your Skin and Mod Menu
Get any cosmetic from Essential Mod
Click Mods
Try to edit the config of Show Me Your Skin
Game crashes.

This seems to be an issue with Essential that I can't really do much about on my end. It's wrongly assuming you to be logged into a world when it tries to render cosmetics, which is not always the case.

The config screen should work fine when you are logged into a world, but an actual fix will have to come from Essential. It should be a one-line change on their side.

I'll close this issue, but I can provide more technical information here if its required.

Hi, Essential dev here. We've fixed this in 1.2.1: https://essential.gg/changelog. Just (re)start your game to receive the update.

That is awesome! Thank you!