Duplicate items in playlists setting?

I’m wondering if there’s an option that would give me a notification message or something akin to that, if I accidentally added a duplicate item to a playlist. I sustained a head injury several years ago and my memory isn’t quite as good as it used to be, so I tend to repeat things or forget things I just did. I’ve been trying to make a playlist of all the Marvel Cinematic Universe movies and I keep adding several of the same films over and over again to the playlist, so I have to go back to that specific playlist and delete the ones I’ve added, which leads me to adding the same movies back to the playlist again, eventually, because I forget about it. Just wondering if the option is there, thanks.

Normally, you cannot add duplicates to playlists in Plex.
They get removed automatically.