Duplicating Prefab causes Unity Editor crash

I have some prefabs that whenever I duplicate them they cause an unhandled exception and crash unity. I can duplicate them by going into explorer and copying the file and then renaming in the editor but I need to find out why they would cause a crash. My project will eventually be an asset for sale on the store. I am not sure where to go from here as I am fairly new to this sort of thing in Unity.

 

For anyone that finds themselves here with a similar problem, I found the answer. For the prefabs that were causing the crash, the meta file had bad formatting in it. After the word guid there was a space between the word and the colon. The same issue was there for the word PrefabImporter also.

I don't believe that this was a Unity issue as I use an asset that will automatically create prefabs for me from outside of Unity. I will get with the asset author and see if he can update their solution.