I used SethBlings ChangeSpawnerProperties to change properties on a Horse spawner and got this 2 times.

Put the summary of the bug you're having here

What I expected to happen was: The filter changes the properties on the spawner to have a player detection range of 0.

What actually happened was: My game crashed twice.

Steps to Reproduce:*
1. Create a horse spawner.
2. Change properties to player detection range of 0.
3. Open the world. I crashed there.