Crash with a sign

Putting a sign on a wall next to a torch and above glass is fine untill you have to type something in and it crashes.

I thought i could put a sign on a wall and type it in.

Minecraft crashes and i have to turn my Kindle Fire off and on.

Steps to Reproduce:
1. Be on creative and build a small dirt house.
2. put glass on bottom,torch to Left, then sign right of torch,above the glass
3. Try to type. (I think it only works on kindle fire.)