Mc version: 1.16.5
Mod version: astralsorcery-1.16-1.16.5-1.13.12.jar
Forge Version: 36.2.4
Java version: 1.8.0.311
Mod list: https://paste-bin.xyz/20959

What happened: I was searching for something in the Astral Tome, and then... crash.

Here's my latest log:
latest.log

Can you give any more detailed steps on how to reproduce this? I think I've narrowed it down to trying to delete a section of text with a negative length, but I have no idea how you managed to do that. Also your Java version is 1.8.0_51, not 1.8.0.311.

Code:

         int var2 = Math.min(this.cursorPos, this.selectionPos);
         int var3 = Math.max(this.cursorPos, this.selectionPos);
         String var4 = var1.substring(0, var2) + var1.substring(var3);

where this.cursorPos or this.selectionPos is equal to -3

Honestly, I have no idea how to reproduce that. I was just looking through the Astral Tome in the "search section" and I was looking for something involving "attunement". That crash happened to me only once and I think it might be that kind of crash which happens once every 342324235252324 centuries, so... And yeah, I know about the java version. Someone on the Astral Discord pointed it out to me. Since I rectified the issue with the Java version, that crash disappeared.

If it helps, I'll leave here the mod list I was using.

Has this one repeated since the java update @EuSuntMarian ?

Nope 👌

Gonna mark this one as a weird java thing, then, unless someone else can replicate.