Describe the bug, provide any errors
Despite the issue being in viarewind, the error told me to report it here so here i am.
While setting up to reproduce and fix #191 i found an actual VV bug.
Getting disconnected from bungeecord when a plugin message is sent by a proxy plugin with the following error https://pastebin.com/k0WZs2bX

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

1. Install latest version of all 3 via plugins on the proxy (i was using hexacord for it's 1.7 support)
2. Install a plugin that sends plugin messages on the proxy (no bukkit plugin for responding is needed)
3. Join a 1.8.8 server with 1.7.10 client
4. Wait for the kick (may not even let the client in, depending on when the plugin message is sent)

Expected behaviour
Proper packet translation / skip if not possible.

Screenshots
Not much really, just this in the client http://prntscr.com/tybhoj

ViaVersion Dump
https://dump.viaversion.com/d3fada9256d96ce1cde0bd558ad5b5337b3cc52d9659222a349378b2b562aef9

Additional server info
Pretty much everything was said above.

Checklist

• 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