https://gist.github.com/ProsperCraft/5dcf71e37fa593c7e15c02e6ab69f513

I am trying to track down what the users were doing at the time of the crash.

Here is another after that last one.
https://gist.github.com/ProsperCraft/27a81a2c11067fb4321e0ed185f3992d

trying to craft combustion generator
http://pastebin.com/Gi5pkdAq

It is already fixed in dev

See #556 and probably also #532