Nasty glitch may allow users to make other people accounts unplayable

Put the summary of the bug you're having here

Glitch that probably allows to make other people realms accounts unplayable / blocked?

What I expected to happen was...:
Describe what you thought should happen here

Found by accident

What actually happened was...:
Describe what happened here

Every time you try to log in with infected account, your device crashes. (Reinstalling app, trying different device = not working [same device clean account = no crashing/any kind of problems])

Steps to Reproduce:

I'm not sure if I wan't to share 'how to' publicly, since you can use it against other people (anyway I could share info not so publicly? :S )

P.S. Have you guys had any kind of crashing when logging in (in past 7 days)
If you haven't tested logging in with your accounts could you try it now?
[Your accounts may have been taken down too]