When ever I place a sign in creative mode it will go to the type screen. But when I try to type my kindle fire will freeze

All i wanted to do was place a sign, and i thought it will let me.

But what actually happened wasmy kindle will freeze whenever i try writing on the sign

Steps to Reproduce:
1. First launch minecraft pocket edition and go to any world on creative mode
2. The place a sign and try writing on it ( use on a kindle fire hd)
3. ...