InvalidItemStateException on delete: this item does not exist anymore

[#1]

I am getting an error when deleting a component:

Caused by: javax.jcr.InvalidItemStateException: This item 
[/content/OBFUSCATED_PATH/responsivegrid/story_cards_componen_1364741682] does not exist anymore

As you can see the resource DOES exists so I am not sure why I am getting this error. Any ideas?

[#2]

It was our own code that was causing the error. We had a SlingPostProcessor that was trying to access the resource. We now only proceed when no deletion modification is found.