Describe the bug, provide any errors
A clear and concise description of what the bug is. Can you https://paste.gg/ the error?
Error: https://paste.gg/p/anonymous/ff9681b68d0e4284bd948b2d7fa75cb2
Notices: "Index 10819 out of bounds for length 48" the first number always changes but the 48 always stays the same.

1.9.x and above can Login just fine.

How can we reproduce it?
Steps to reproduce the behavior:

1. Login on 1.8.9'
   2 You get kicked.

Expected behavior
Able to log in to lobby and not get dc.

Screenshots
You can't get a screenshot if it kicks in 1ms you aye?

ViaVersion Dump:

• Type /viaversion dump, and put the link here.
  https://dump.viaversion.com/1dddfa348ab14cacdb528d823eea0d3e849acb8b19239419c2ddb38de1253fcf

Additional server info
Do you use a proxy (eg. BungeeCord)? What software do you use and what plugins?

Waterfall#436 (Bungeecord/Proxy)
Plugins on Proxy:
Litebans-2.7.1.jar
TAB_Premium_v2.8.11-pre18.jar
Gyser+Floodgate 2.0
Party And Friends + Extensions

Checklist (mark with [X] to check)

• I have included a ViaVersion dump
• If applicable, I have included a paste (not a screenshot) of the error
• I have tried a build 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

IMPORTANT: Follow the Checklist or we can't reproduce your issue and your issue will be close

Works fine for me with the latest Via*

Works fine for me with the latest Via*

I tested 1.8.8 myself and it seems 1.8.9 is the issue.

I tested 1.8.8 myself and it seems 1.8.9 is the issue.

1.8.9 also works fine for me. You have to try which of your plugins cause it