Signs! NOOOO!

Signs!

What I expected to happen was...:
I crafted a sign, placed it, pressed shift, and as soon as I pressed a letter... Crash!

What actually happened was...:
I tried this a few times in different ways. No matter what I did, entering any text on the sign made the game crash!

Steps to Reproduce:
1. Craft a sign.
2. Place the sign anywhere.
3. Try to enter text!

Please fix this soon, I'd like to have labels for stuff on my survival world!
Thanks for reading!