Steam Producer build 73: Crash on world loading

[walkerjonny]

I'm getting this crash when I want to load a world that has one Steam producer block placed. In this case it is a Steam Producer(Steam) block. I had this both with build 70 and 73. However, the crash does not happen when I place that block, it happens only when I'm loading the world afterwards after a new game start. Maybe you should have a deeper look into it. http://pastebin.com/UGPufMFF

Since I don't know if you had a look into this while ýou created build 74 I'm posting this here. Original post is at minecraftforum.

One suggestion: Place a link to the issue tracker on your minecraftforum thread OP. That helps to place the issues on the right place.