Exception in server tick loop Caused by: java.lang.IllegalArgumentException: value already present: null

I have confirmed that ...

[X] Arclight is up to date
[X] all dependencies are installed
[X] all plugins and mods are up to date
[X] unable to reproduce in Spigot
[X] unable to reproduce in Forge

Arclight version

arclight-1.19.4-1.0.8.jar

OS & Java versions

java 17.0.10

Plugins and Mods

Plugins:
ColoredSigns-6.2.1.212
EssentialsX-2.21.0-dev+81-cde7184
EssentialsXAntiBuild-2.21.0-dev+81-cde7184
EssentialsXChat-2.21.0-dev+81-cde7184
EssentialsXGeoIP-2.21.0-dev+81-cde7184
EssentialsXProtect-2.21.0-dev+81-cde7184
MinetopiaSDBRel-v2.6.1
Multiverse-Core-4.3.1
PermissionsEx
Vault
worldedit-bukkit-7.3.0
worldguard-bukkit-7.0.9-dist

mods:
[1.19.4] SecurityCraft v1.9.9
architectury-8.2.91-forge
car-1.19.4-1.0.4
cfm-forge-1.19.4-7.0.0-pre35
cloth-config-10.1.117-forge
dynamiclights-v1.7.1-mc1.17x-1.20x-mod
Fallingleaves-1.19.4-2.1.0
FallingTree-1.19.4-3.13.1
jei-1.19.4-forge-13.1.0.15
Joban-Client-Mod-1.19.4-1.2.2
MTR-forge-1.19.4-3.2.2-hotfix-1
skinlayers3d-forge-1.6.4-mc1.19.4
voicechat-forge-1.19.4-2.5.12

Description

I wanted to create a server with mods and plugins, but when starting the server I got an error. I don't quite understand what is meant. That's why I'm just contacting you. I hereby attach the latest log and the crash report.

Step to reproduce

No response

Logs

latest.log

crash-2024-05-06_16.50.45-server.txt

Server pack link (Optional)