Update Deal's Label via API - Error 500

Hello,

I am facing a problem where I need to change Deal’s Label with API.
I figured out that it should not be a problem to edit it like all the other things:
{“label”: 48}
But here I only received the following: 500: Internal Server Error occurred. Pipedrive staff was notified about this. (undefined)

Other fields work as usual, I even tried using the field’s key, but without success.
Since this problem persists, I am seeking help here.

With regards,

David V.