When I clicked on login/sign up in the realms server on the pocket edition, it turned white and I couldn't do anything

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
It should have pulled up a screen to login/sign up
What actually happened was...:
Describe what happened here
It turned completely white and I could not do anything. I even tried getting out of the game, but it still wouldn't work.
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
1. Click on play on realms
2. Click on login/sign up
3. Turns completely white