server_custom_channel example doesn't work

• The FAQ doesn't contain a resolution to my issue

Versions

• minecraft-protocol: 1.25.0
• server: none
• node: 14.12.0
• minecraft version: 1.16.5

Detailed description of a problem

I tried to run the server_custom_channel example and it crashed when I tried to connect, giving this error:

D:\Documents\dev\fabric\proxy>node main.js
D:\Documents\dev\fabric\proxy\node_modules\minecraft-protocol\src\transforms\framing.js:67
          } else { throw e }
                   ^

TypeError: SizeOf error for undefined : value.reduce is not a function
    at ProtoDef.sizeOfDumbArr (D:\Documents\dev\fabric\proxy\node_modules\minecraft-protocol\src\client\pluginChannels.js:96:18)
    at ProtoDef.sizeOf (D:\Documents\dev\fabric\proxy\node_modules\protodef\src\protodef.js:40:67)
    at ProtoDef.sizeOf (D:\Documents\dev\fabric\proxy\node_modules\protodef\src\protodef.js:131:31)
    at e.message (D:\Documents\dev\fabric\proxy\node_modules\protodef\src\protodef.js:138:40)
    at tryCatch (D:\Documents\dev\fabric\proxy\node_modules\protodef\src\utils.js:50:16)
    at ProtoDef.createPacketBuffer (D:\Documents\dev\fabric\proxy\node_modules\protodef\src\protodef.js:138:20)
    at Client.writeChannel (D:\Documents\dev\fabric\proxy\node_modules\minecraft-protocol\src\client\pluginChannels.js:68:19)
    at Client.registerChannel (D:\Documents\dev\fabric\proxy\node_modules\minecraft-protocol\src\client\pluginChannels.js:26:14)
    at Server.<anonymous> (D:\Documents\dev\fabric\proxy\main.js:31:10)
    at Server.emit (events.js:314:20)

Current code

https://github.com/PrismarineJS/node-minecraft-protocol/blob/master/examples/server_custom_channel/server_custom_channel.js

Expected behavior

The example should run smoothly :p

Start with examples/server_custom_channel/server_custom_channel.js and run it against Minecraft 1.16.5 to reproduce the connection failure. Then inspect src/client/pluginChannels.js at the registerChannel and writeChannel paths, using the reported stack trace as the entry point. Done means the example connects without the SizeOf error.