I shared a piece of code in my question, that apparently had some characters missing that were causing the root of my problem. Telling me this would have solved my problem. However, a user chose to edit the missing characters back into my post.
Luckily someone answered the question before the edit was made, and I noticed what went wrong, but what should one do when a 'wrong' edit was made?
Do you simply reverse? Is there a way to flag this person? If they don't know they are doing anything wrong they will probably keep doing it.