Is this something that is written in your training plan or just some random stuff like ‘Hey I just feel like doing a few sets bicep curls’?
If it’s something you are actually supposed to do that day I’d make there is also at least some kind of rough progression scheme with that movement as well although.
But in any case, for whatever reason you do that, as long as it’s not hindering your recovery from sessions just keep doing it if you enjoy it that much. Remember, training should be fun as well.