Put the summary of the bug you're having here
What I expected to happen was...:
i should have just put the coal in the furnace
What actually happened was...:
the game crashed
Steps to Reproduce:
1. put down a furnace in survival
2. put 16 coal in furnace
Environment
OS: Windows 10 (ver 10.0, arch amd64)
Java: 1.8.0_25 (by Oracle Corporation)
Launcher: Minecraft Launcher 1.6.61 (bootstrap 100)
Minecraft: 16w39a (updated Wed Sep 28 15:33:50 CEST 2016)
Duplicate of MC-107392