I can't find the problem with this error on angular

Question

I got this error on angular enter image description here

and this is my service :

enter image description here

and this is my function on the component.ts

enter image description here

the problem is on the consol ther is a lot of error : ERROR TypeError: ctx.list is undefined ConsltoppoComponent_Template consltoppo.component.html:

also whene the data is null the page is blocked, i have other service is working good.

on html i call the list like that : enter image description here

and the type of the list is any

i hope i explain the problem, to get help of this problem

Answer 1

You have an asynchronous call, that sets the result to the field list. As long as the call is pending list will be undefined, which will lead to errors, since you try to read typ_pret from list. It means you try to read a property of undefined. Make your template safe, add an *ngIf="list" to your input element.