when you break a dragon head with a dragon head in your hand the game crashes

Put the summary of the bug you're having here

What I expected to happen was...: that the dragon head was going to break like another head, as the head of skeleton or zombie
Describe what you thought should happen here

What actually happened was...: that when the head was about to break my game crashed
Describe what happened here

Steps to Reproduce:
1. take a dragon head and place it anywhere
2. take another dragon head
3. now break the head that you placed with the other dragon head.