Breaking a renamed minecart can crash the game

When you breaking with a renamed minecart as an entity, the game will not respond and crashes.

Step to Reproduce
1. Get an anvil and a minecart.
2. Rename the minecart to anything.
3. Place it down on a rail.
4. Break it.

Expected Result
Breaking it would not crash the game.

Observed Result
The game crashed.

Note: This also happens when you're attempting to save and exit the world, or trying to export the structure with a renamed minecart.