Hi @Philippe, I am sorry to hear you’re having trouble.
I just tried updating a Notion page on [email protected] using the below workflow:
My database looks like this (with one title field, one multi-select and one checkbox):
The Notion node is set up like so:
Perhaps you can confirm how exactly your problem can be reproduced and which version of n8n you are using?
The error message coming from Notion suggests you are sending a bunch of undefined values, perhaps you are using expressions that don’t quite work (a very common problem would be this one for example)?