Console error spam when achievement pops up

[SnowBlitzz]

Terms

• I'm using the very latest version of ItemsAdder and its dependencies.
• I am sure this is a bug and it is not caused by a misconfiguration or by another plugin.
• I already searched on this Github page to check if the same issue was already reported.
• I already searched on the plugin wiki to know if a solution is already known.
• I already searched on the forums to check if anyone already has a solution for this.

Discord tag (optional)

SnowBlitzz

What happened?

A long error pops up in console when someone gets an achievement
error: https://pastebin.com/LirTNSNZ

Steps to reproduce the issue

1. Get an achievement in-game
2. This error will pop up and spam console

Server version

1.16.5

ItemsAdder Version

ItemsAdder_3.6.2c

ProtocolLib Version

5.1.0

LoneLibs Version

1.0.45

FULL server log

https://pastebin.com/LirTNSNZ

Error (optional)

No response

Problematic items yml configuration file (optional)

No response

Other files, you can drag and drop them here to upload. (optional)

No response

Screenshots/Videos (you can drag and drop files or paste links)

No response

[github-actions]

Hello,
your report will be looked into as soon as possible.
Please do not bump this thread and don't post it on multiple platforms.

Thanks a lot for your patience.

[LoneDev6]

Can you update ItemsAdder and LoneLibs?
I fixed this issue some time ago: #3282