Function FieldValue.arrayUnion() called with invalid data. Unsupported field value: undefined

@mahirmersimoski wrote:

Im trying to post an upload to a firebase but i get this error:

ERROR FirebaseError: Function FieldValue.arrayUnion() called with invalid data. Unsupported field value: undefined
at new n (http://localhost:8100/vendor.js:121742:23)
at t.Aa (http://localhost:8100/vendor.js:127978:16)
at t.Na (http://localhost:8100/vendor.js:128208:17)
at t.va (http://localhost:8100/vendor.js:128111:21)
at http://localhost:8100/vendor.js:128118:23
at k (http://localhost:8100/vendor.js:122576:68)
at t.ga (http://localhost:8100/vendor.js:128117:60)
at t.va (http://localhost:8100/vendor.js:128090:86)
at http://localhost:8100/vendor.js:128216:22
at Array.map ()

This is the code and under createPost() there is the code that i get error on

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import {AngularFirestore} from '@angular/fire/firestore'
import { UserService } from '../user.service';
import {firestore} from 'firebase/app'

@Component({
  selector: 'app-uploader',
  templateUrl: './uploader.page.html',
  styleUrls: ['./uploader.page.scss'],
})
export class UploaderPage implements OnInit {

  imageURL: string
  desc: string

  constructor(
    public http: HttpClient,
    public afstore: AngularFirestore,
    public user:UserService
    
    ) { }

  ngOnInit() {
  }

  createPost(){
    const image = this.imageURL
    const desc = this.desc

    this.afstore.doc(`users/${this.user.getUID()}`).update({
      posts: firestore.FieldValue.arrayUnion({
        image, 
        desc
      })
    })
  }

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