So, I searched for previous issues prior to creating this and found issue #2120. This is a duplicate of my issue, and I'm currently using LuckPerms 5.0.72, which I believe is older than the c3128de commit you mentioned in that issue.

Proof of being a duplicate:

My question is this - how do I go about using this commit? I've never learned how to compile a jarfile from GitHub, and before digging into that, I want to be certain of what exactly I'm supposed to do to use this edit you made.

Minor edit:
Apparently despite throwing an error, LuckPerms still correctly assigned permissions:

Does this mean I have nothing to be concerned about? Or are there issues which may occur that still require me to use the commit you made?

Okay, updating from 5.0.72 to 5.0.128 resolved this issue. Thank you again, @BrainStone.

https://luckperms.net/ for downloads.

https://luckperms.net/ for downloads.

Huh. Well, today I learned LuckPerms has a dedicated website and Jenkins. I've only ever been aware of the GitHub and Spigot page. Thank you, @BrainStone.

I'll test the latest dev build (5.0.128) and see if it resolves the issue.