Describe the bug
Its just a console error. Not sure what negative effect it could lead to.

To Reproduce
Steps to reproduce the behavior:
All I did was start my server and log in.

Expected behavior
N/A

Screenshots
N/A

Version Info
Provide your ProtocolLib install info with /protocol dump through pastebin.
https://www.toptal.com/developers/hastebin/pabepeyexi.properties

Additional context
N/A

This is fixed in the 4.7.0 release. Find it here: https://github.com/dmulloy2/ProtocolLib/releases/tag/4.7.0