IMHO you have judge the guy over more than one game and he's been first class this season. It's just unfortuntate that his mistake came in the same game as Santons and, together, they've probably cost us any chance of qualification.
It there's only one error and we bring a 2-1 back to our place then there's a real chance.
Hope the mistake doesn't impact his confidence as we really need him to maintain his recent form.