Reported on CurseForge: http://minecraft.curseforge.com/projects/applecore?gameCategorySlug=mc-mods&projectID=224472#c12

Crash log: http://pastebin.com/HWABcr0Q

Not sure what could cause a null pointer in ClassReader constructor. Perhaps a null byte array is being passed from the Forge transformer?

9ee4d89 should actually fix this.