/viaversion dump Output

https://dump.viaversion.com/973b4ac05629c295d166546dec7e3f493a9b75eb5d7beeb3ad6f5ac9c7f8fb2c

Console Error

https://mclo.gs/YsI7Ias

Bug Description

when player server joined

Steps to Reproduce

login with 1.8.8 client
and get issue

Expected Behavior

Access is possible in the latest version

Additional Server Info

No response

Checklist

• Via plugins are only running on EITHER the backend servers (e.g. Paper) OR the proxy (e.g. Velocity), not on both.
• I have included a ViaVersion dump.
• If applicable, I have included a paste (not a screenshot) of the error.
• I have tried the latest build(s) from https://ci.viaversion.com/ and the issue still persists.
• I have looked at https://www.spigotmc.org/resources/viarewind-legacy-support.52924/ and it does not offer a fix for my problem

Please provide the full server log as well as more context about this issue, try if it also appears on 1.9 clients and try to perform a binary search on your plugin list:

1. Remove half of the existing plugins and put them aside for now,
2. Run the server again,
3. Is it still creating errors from there?

(If yes; Repeat from step 1 with current items)
(If not; Swap out the current plugins with the ones set aside and repeat from step 1)

4. Repeat process until problematic plugin/s are found.