How to error check in dynamo before it fails

Hello, is there a way to error check something before trying to write to revit. I would like to be able to check all of the view names that I currently have in the project against what I would like to rename a list in mass too. I keep getting error messages and no matter how many of the errors I resolve manually, more keep popping up. In my graph, I am simply just trying to set the view names of the main viewport on every sheet to equal the current sheet name which it resides on, except it keeps puking out error messages telling me that the view name is already in use.

Perhaps is there a way to maybe sidestep this by maybe appending a suffex to EVERY sheet, simultaniously while running the script so that it doesnt find the same name that I am trying to write to. Does that make sense? Anyways, here is my graph: