Logs:
https://mclo.gs/4nmIKAU

Steps to Reproduce:

1. Create new Forge server
2. Run with command java -Xms2048M -Xmx$4096M -Dterminal.jline=false -Dterminal.ansi=true -Dlog4j2.formatMsgNoLookups=true @libraries/net/minecraftforge/forge/${version}/unix_args.txt nogui
3. Connect to server with OP account and press E. Immediate disconnect/crash

Description of issue:
Wanted to test Dragon Eggs in Creative mode but I can't even open Creative Inventory... Latest version of Minecraft/Forge/Mod are installed. In singleplayer I'm able to open inventory

Tracked this down yesterday after @FaNt4zMa posted their crash on Discord. Not sure if it's the 'correct' fix, but it at least stops the mod bringing down a server here. Can do a proper PR if the below attached diff isn't trash 😛

ETA (with correct patch this time):

dml-server-nullderef-hack.diff.txt