Error message: Cannot lookup a property on a NULL value

Hello everyone,

I'm having this weird issue where I use a JSON generator to create a payload for the following HTTP client snap, but apparently all the values resulting are NULL, which is weird because the output of the JSON looks fine.

This is what I use in the JSON generator:

And the output looks just fine:

However, in the following HTTP client snap, the output preview gives an error because apparently the value is null.

Can someone help me find out what I did wrong?

Thanks in advance!

JF