Reported via Twitter, pastebin: http://pastebin.com/8nczijnX

---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 09.12.13 15:20
Description: Unexpected error

java.lang.IllegalArgumentException: Direction already exposed
at erogenousbeef.bigreactors.client.gui.GuiCyaniteReprocessor.createInventoryExposureButton(GuiCyaniteReprocessor.java:50)
at erogenousbeef.bigreactors.client.gui.GuiCyaniteReprocessor.func_73866_w_(GuiCyaniteReprocessor.java:76)
at net.minecraft.client.gui.GuiScreen.func_73872_a(SourceFile:94)