I added an attribute to a stick and the game crashed

Put the summary of the bug you're having here

*What I expected to happen was I could add a speed attribute to a stick

*What actually happened was my game crashed

Steps to Reproduce:
1. Download the "Add attribute" filter for mcedit
2. Add an attribute to an item not meant for attributes (ex. stick, steak, coal)
3. Open the container with the item in it