Armor damage bug

Put the summary of the bug you're having here

What I expected to happen was...:
you would take off the armor and the game would adjust accordingly

What actually happened was...:
When I was hit and took off my armor at the same time, my app crashed (it has happened multiple times and happens on all iOS devices.

Steps to Reproduce:
1. Get any type of armor
2. Get damaged by a mob or other player
3. Simultaneously take off the armor when it turns red