Minecraft crashes when using feedback light buttons when checking if the button is powered (FLightButtonPart.isPowered()).
Side: client + integratedServer
Version: commit 773c6f1
Forge version: release 1.7.2-Forge10.12.2.1121
Crash report: http://pastebin.com/D723VZ1G
CCCore version: 1.7.2-1.0.0 universal
CCLib version: 1.7.2-1.1.1.87 universal
Forge Microblock version: ForgeMultipart 1.7.2-1.1.0-289 universal

Strange, can't reproduce. But maybe fixed by 18b83b2