I am running a small survival server (in offline mode) for some friends. there are usually 2-10 players online. large mob farms are used often but they haven't caused any problems. There were 3 or 4 people online when I crashed. Nothing much was happening except we all just got a huge lag spike and then were kicked.

I run it on a MacBook from Late 2010 (as specified in Environment). so its pretty old but has never caused a problem until today.

Stack Trace of crash: https://hastebin.com/gemegiwovu.md

Crash Report File: https://hastebin.com/waxegerife.rb

Plugins: ArmoredElytra, ChatEx, Citizens, ConsoleSend, CoreProtect, DeadChest, DiscordSRV, DropHeads, Dynmap, EssentialsX, FairEXP, GSit, Multiverse-Core, Multiverse-Portals, OpenInv, PermissionsEx, ProtocolLib, Shopkeepers, SkinsRestorer, Skript (Anti-Xray), WorldEdit