Description of the Bug
Client (not sure about server) crashes when spawner cart is disabled in config

To Reproduce
Clean 1.12.2 instance with newest Forge (14.23.5.2815) and disable spawner cart. Next client boot will crash

Expected behavior

Screenshots & Video

Logs & Environment
Minecraft: 1.12.2
Forge: 14.23.5.2815
Railcraft: 12.0.0-beta-5

Crash report (If available):
crash report - https://paste.dimdev.org/awaqodexet.rb
latest.log - https://paste.dimdev.org/efajexujox.md

Additional context

hmm, guess i might just remove the option to disable it. why do you need to disable it? it is creative only and already exists in vanilla

Don't need to disable it (was just disabling everything that's not needed and noticed the crash)