Mod Version:
6.3.6
The version that is installed in your pack.

Forge Version:
1.12.2 (forge: 14.23.5.2855)
The actual Forge version - "latest" does not count.

Link to client log:
https://pastebin.com/uwZyADNN

Link to crash log:

Minecraft didn't seem to generate a crash log.

Description:
I tried adding a custom .ogg file to replace the battle music. The default audio provided works perfectly fine, but when i try replacing them with my own with the exact same file name, the game freezes (doesnt crash back to the launcher) whenever a hostile mob notices me.

Problem has been replicated with the mod by itself and its dependencies.

I have searched for similar problems on the closed and open issues tab, and found nothing useful.

Here is the pack I have modified:
BattleMusic.zip

Would honestly be nice if there were public packs like this one, or a generator program that could just generate & compile one for you.

Developer seems inactive/dead anyway, doubt this'll be fixed anytime soon.