Forge Version: 31.2.31
Minecraft Version: 1.15.2
WorldSeed: -5828303611848360714

Describe the bug
Dedicated multiplayer server crashes occasionally, unsure of details.

To Reproduce
Steps to reproduce the behavior:

1. Unsure, three of us were playing as usual - building or exploring - when this happened

** Stack Trace**
https://pastebin.com/88BKAhFa

Looking into this.

Are you using the default code where the cows both eat and grow grass?
Have you used the forge "remove ticking entities" setting? (by default it's false).

Okay the code there is very simple- no loops. It basically just destroys one block or bonemeal's once.

Not sure what is going on and can't duplicate the issue yet.

In the meantime- here is a fix to get you going.

Look in saves/serverconfig/forge.toml
Set this value to true.
removeErroringEntities = false
Start and stop your server.
Reset this value to false.
removeErroringEntities = false

I'll look at this more tomorrow when I'm fresh.

Final update....
1.15.1/2 and 1.16.1 are now feature synchronized and have the new null pointer protection. Reopen and let me know if you see the failure again!

Okay, I didn't find an obvious issue but I did see several places where I assumed something existed. I have added a bunch of checks for "null" values in those places.

I also added some debugLevel=2 debugging statements for "trying to eat" and "trying to grow".

The new version is Regrowth 1.16.1 1.0.0.5.

I'm now adding these new protective changes to version 1.15.1/1.15.2.

I hope this will prevent the issue from reoccuring in your world.

I'll give you another update when the 1.15.2 version is ready for you to download.

Okay the 1.15.2 version 1.0.0.5 has been approved.
It has extra protection against null pointers ( which I saw in the crash log).
It has a couple advancements.

There will be a 1.0.0.6 version soon which will have the villager logic improvements so they build walls better when they are hanging off the edge of blocks.
And a 1.0.0.6 version 1.16.1 version which will have the advancements (bringing both 1.15.1/2 and 1.16.1 into sync).