MC Version: 1.12.2
Mystical Wildlife version: 1.12.2-1.2.1 (latest)
Erebus version: 1.0.29 (latest) https://minecraft.curseforge.com/projects/the-erebus/files/2692096

Ok, Whenever i'm the erebus' petrified forest biome. I've seemed to have crashed with a ticking entity crash.

The crash could most likely resulted If I set any one of your mob's spawn weight to 0. (aka disables that spawn) [I've disabled crimson's spawn by setting their spawn weights to 0.]

And yes, I even did this with a freshly generated config. (but had the crimson spawn weight set to 0)

Crash report: https://pastebin.com/i37pAkcY

Yes, I know I've done this in 1.2.0, but I've tested it in this version too. And It still crashes.

Steps of what I've did to replicate the crash:

Again, I've done this with crimson spawn weights set to 0.

1. If you're using the world file I've provided, load that world and then set the game to peaceful first.
2. And then set the game back to normal mode again.
3. Fly around within the Biome. (May take a couple of minutes for the freeze and then crash)
4. Game should crash and give the same crash report as I've got.

Only thing I've changed in the config (I've done it in-game instead):

    cicapteracrimson {
        # Min: 0
        # Max: 2147483647
        I:maxGroup=4

        # Min: 0
        # Max: 2147483647
        I:minGroup=3

        # Min: 0
        # Max: 2147483647
        I:weight=0
    }

Even though it doesn't matter if it's a new world or not, I'm just gonna include this world file. So you don't have to create the world, enter erebus, and then teleport to a petrified forest.

https://www.mediafire.com/file/uwmu48cn77ysr8x/just_so_you_don%27t_have_to_tp_to_erebus_and_the_location.7z/file