Cannot read property 'x' of undefined ts

[EmoraBB]

Hi, I’m new here. The first, sorry for my english

Well… I want to create a JSON object to call an api resource. I get all the vars from 3 forms and bind it to 3 variables.

Here the 3 console.log to each one when i click on “create client”

But when i try to create an object i get this error Cannot read property ‘fuente’ of undefined.
I need to create an object like this:

Gyazo

So i try this for example:

Gyazo

But i get this error:

Gyazo

I know that in view i should use: “{{ segmentacion.fuentes?.id }}” because DOM but i don’t know what is the problem here.

Thank you and again, sorry for my bad english.

[Sujan12]

You create this.post. Then you try to write stuff in this.post.segmentacion.fuente. But this.post.segmentacion doesn’t exist yet, so it tells you exactly that.