Reported on CurseForge by @DRG-TheLonedeveloper.

Hey! so I was trying to get my custom discs by having a skeleton kill a creeper, and my game crashed. Here's what it said

"The game crashed whilst ticking entity
Error: java.lang.IllegalArgumentException: bound must be positive"

I also created a pastebin of the crash report: https://pastebin.com/yZwP1dfd

I also recorded the moment it crashed:

I also created a pastebin for the config file: https://pastebin.com/rC7k0d8H

and here is the link to the github: https://github.com/DRG-TheLonedeveloper/mcdisc/blob/master/disc-config.json

If there is anything else you need to help solve this problem, please let me know.

I believe the issue might be related to having an invalid config (i.e. the game somehow believes that you have 0 custom discs). Can you confirm that your custom discs show up and work correctly in Creative Mode?

Also, from the stack trace, I see that you have a mod which might interfere with mcdisc's custom creepers. Does the issue also occur with only this mod installed?