In this question on the Movies & TV Stack Exchange the question starts with the following observation:
Actor Philip Seymour Hoffman, who portrayed a character in The Hunger Games, passed away during the middle of filming for the Mockingjay movies.
I am not a native speaker, but to me this sounds incorrect. It looks like a combination of "during filming" and "in the middle of filming" (and even "during filming" doesn't feel right).