Hello. There seems to be an odd bug in this mod:

When https://mods.factorio.com/mod/jetpack equipment is active and the player tries to switch to any skin, including this one while flying the error is shown:

The mod Emberthal Character Reskin (1.1.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event emberthal::on_tick (ID 0)
LuaRenderObject API call when LuaRenderObject was invalid.
stack traceback:
[C]: in function 'newindex'
__emberthal/scripts/compat/jetpack.lua:8: in function 'player_on_tick'
emberthal/scripts/compat/jetpack.lua:80: in function <emberthal/scripts/compat/jetpack.lua:21>

I just need to know what's the mod you use to switch skins so I can look into the issue

I encountered it with:
https://mods.factorio.com/mod/minime

Though i do use skins which depend on these:
https://mods.factorio.com/mod/RitnCharacters
https://mods.factorio.com/mod/skins-factored

So it's possible the other two have issues as well.

Should be fixed now in version 1.1.1

Thanks for the report!

Thanks, seems solved :D