If bug:

• Forge Version: 31.1.24
• Mod Version: FruitTrees-1.15.2-1.2.0
• Can you reproduce this issue with relevant mods only?: yes/no
  the only mod i disabled in pack was fruit trees not sure if mod conflict or some you changed caused it to bug out some how

without fruit trees
https://gist.github.com/SDUBZ/1a17a0bce0c824ac3255ff2f56a93a0c
with fruit trees
https://gist.github.com/SDUBZ/83180e9200d55a812098ddc3aa28a0b1

Fixed

This is still an issue in version 1.2.1, with Forge 31.1.27.

This is the relevant section of the crash log above that is still occurring after the update:
https://pastebin.com/F3k1h6t7

@Vaelzan Did you install MixinBootstrap?

Yes, of course. If you want to see it reproduced, look at the mod pack Valhelsia 2.1.3 on Curse. Everybody using that version has the issue (Forge 31.1.27, MixinBootstrap 1.0.2, FruitTrees 1.2.1). I've been bombarded with support requests this morning after waking up.

@Vaelzan Please provide a full crash report

I didn't provide a report because it's almost identical (in all the ways that matter anyway) to the one the OP posted.

I believe this might be the issue anyway, in your petal particle implementation:

After doing some digging in the Minecraft initialization code, I found the solution to my problem: I was registering my particle factory in response to the wrong event. Rather than doing it during client setup, it turns out there's an event specifically for when you're supposed to register your particle factories: the aptly-named ParticleFactoryRegisterEvent. After moving my factory registration code there, everything seems to load just fine. Thanks anyway!

from https://www.minecraftforge.net/forum/topic/76872-solved-1144-redundant-texture-list-for-particle/

@Vaelzan Thanks. I will look into it

@Vaelzan I can not reproduce this in normal way, but I have changed the way particle registering