Issue Description:

Acording to people on my server, it is crashing do to this error here: https://gist.github.com/Modpack-Support/33fd04a2630177e17a969c13fab8d916

What happens:

Not sure as I was not around at time of said crash

What you expected to happen:

A reason to why this is happening

Steps to reproduce:

...

Affected Versions (Do not use "latest"):

• EnderIO:1.12.2-5.0.40
• EnderCore: 1.12.2-0.4.45
• Minecraft: 1.12.2
• Forge: forge-1.12.2-14.23.5.2815-universal
• SpongeForge? yes/no no
• Optifine? yes/no no
• Single Player and/or Server? Server

Your most recent log file where the issue was present:

[pastebin/gist/etc link here]

Try without these:

LesslagCorePlugin (lesslag-1.0-1.12.2.jar)
VanillaFixLoadingPlugin (VanillaFix-1.0.10-99.jar)
Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.3-1.12.2.jar)

Those are candidates that may mess with java.util.ArrayList

Neither should mess with ArrayList, to my knowledge.

By the way, @ghost, there's no reason to use Less Lag if you have VanillaFix installed, since the latter disables animations when they're not on-screen.

Anyway, now that the crash log is gone, I cannot do anything. I don't even remember where it was crashing...