[1.12.2]-[1.12-1.8.1]-Packet Decoding Error

[eamondo2]

On clients logging in to the forge server, I get about 20 or so of these output to standard logs. I cannot confirm whether or not this is only when the client has the mod installed, as it will not allow clients to connect without the COG mod installed.
This is independent of debug or wireframe modes being enabled/disabled, either on the client, server or both.
This still occurs even when logging in on the locally hosted server, so not a port blockage issue either.
Additionally, the wireframes will not load on a client connected to this server either, again local or remote connection. Independent of settings as well.
[11:48:06] [Netty Epoll Server IO #5/WARN] [customoregen]: Error while decoding custom packet payload: direct buffer

Attached here are debug.log and latest.log from the server itself. I cannot find anything specifically in the logfiles that indicates the reason for the dropped connection.

debug.log
latest.log

I will take a gander at some of the source and see if I can't track down what might be causing this, I'm not sure what specifically needs sending to/from client/server regarding this mod specifically aside from the wireframe data perhaps?

List of installed mods, Server:

• AppleCore-mc1.12.2-3.1.4
• HardcoreBuoy-1.12-1.0.4
• AppleSkin-mc1.12-1.0.9
• HardcoreDarkness-MC1.12.2-2.0
• Better+With+Addons-0.46
• ImmersiveEngineering-0.12-86
• BetterWithMods-1.12-2.3.16
• jei_1.12.2-4.13.1.222
• Chunk+Pregenerator+V1.12-1.9.2
• CraftTweaker2-1.12-4.1.13
• randompatches-1.12.2-1.7.0.0
• CustomOreGen-1.12-1.8.1
• ShadowMC-1.12-3.8.0
• Dynmap-3.0-beta-1-forge-1.12.2
• Signals-1.12.2-1.3.13-28-universal
• ExtraRails-1.12-1.3.0
• Traverse-1.12.2-1.6.0-69
• foamfix-0.10.2-1.12.2
• WearableBackpacks-1.12.2-3.1.3
• funky-locomotion-1.12.2-1.1.2

List of installed mods, Client:

• AppleCore-mc1.12.2-3.1.4
• HardcoreBuoy-1.12-1.0.4
• AppleSkin-mc1.12-1.0.9
• HardcoreDarkness-MC1.12.2-2.0
• Better+With+Addons-0.46
• ImmersiveEngineering-0.12-86
• BetterWithMods-1.12-2.3.16
• jei_1.12.2-4.13.1.222
• Chunk+Pregenerator+V1.12-1.9.2
• CraftTweaker2-1.12-4.1.13
• randompatches-1.12.2-1.7.0.0
• CustomOreGen-1.12-1.8.1
• ShadowMC-1.12-3.8.0
• Dynmap-3.0-beta-1-forge-1.12.2
• Signals-1.12.2-1.3.13-28-universal
• ExtraRails-1.12-1.3.0
• Traverse-1.12.2-1.6.0-69
• foamfix-0.10.2-1.12.2
• WearableBackpacks-1.12.2-3.1.3
• funky-locomotion-1.12.2-1.1.2
• Optifine_1.12.2_HD_U_E2