Issue description

These 3 mods

Crashing only on dedicated servers, not lan multiplayer.
Removing one of them (no matter which one) solves the issue.
I tried no mixin version of the SecurityCraft but not solved the issue.

Steps to reproduce

No response

Minecraft version

1.12.2

Forge/NeoForge version

forge-1.12.2-14.23.5.2860

SecurityCraft version

v1.9.11

Other relevant versions

No response

If a (crash)log is relevant for this issue, link it here: (It's almost always relevant)

https://pastebin.com/Su39BHsv

This is a bug in the Double Slabs mod, please report this crash to them. They are calling a method that only exists client side on the server.
https://github.com/CJMinecraft01/DoubleSlabs/blob/1.12.x/src/main/java/cjminecraft/doubleslabs/common/items/VerticalSlabItem.java#L59