Entered void with Debug Menu open
Expected: Game not to crash
Happened: Game crashed
To reproduce: Enter void with debug menu open.
Environment
OS: Windows 7 (ver 6.1, arch x86)
Java: 1.8.0_40 (by Oracle Corporation)
Launcher: Minecraft Launcher 1.6.13 (bootstrap 5)
Minecraft: 15w37a (updated Thu Sep 10 10:22:31 EDT 2015)
Happened to me on a cavers delight world