This is because the API endpoints don't match quite well:

https://gitlab.iscpif.fr/gargantext/haskell-gargantext/blob/dev/src/Gargantext/Core/Text/List/Social.hs#L65-67

requires JSON of type: {"type": "NoList", "makeList" :: bool} however the frontend sends only {"type": "NoList"}:

https://gitlab.iscpif.fr/gargantext/purescript-gargantext/blob/dev/src/Gargantext/Components/ListSelection/Types.purs#L26-30

I'm not sure what makeList should be or should it be settable on the frontend? Overall this is easy to fix, but I don't know how you want it @anoe .