How to fix this error 'undefined is not an object'?

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The output error like this:

TypeError: TypeError: undefined is not an object (evaluating '')

there I just want passing data from facebook into my view in react native . it says undefined is not an object, how to fix this ?

Here is the HomeScreen component's code:

import React, { Component } from 'react';
import { Text, TouchableOpacity, ScrollView, View, StyleSheet, Button, Alert, Image } from 'react-native';
import Expo, { Constants } from 'expo';

export default class HomeScreen extends Component {

        this.state = { userInfo: null }

    async logInFB() {
        try {
          const {
          } = await Expo.Facebook.logInWithReadPermissionsAsync('214751749451960', {
            permissions: ['public_profile'],
          if (type === 'success') {
            // Get the user's name using Facebook's Graph API
            const response = await fetch(`${token}&`);
            const userInfo = await response.json();
            this.setState({ userInfo });
            Alert.alert('Logged in!', `Hi ${(await response.json()).name}!`);
          } else {
            // type === 'cancel'
        } catch ({ message }) {
          alert(`Facebook Login Error: ${message}`);

    _renderUserInfo = () => {
            <View style={{ alignItems:'center' }}>
                    source={{ uri:}}
                    style={{width:100, height:100, borderRadius:50}}
                <Text style={{ fontSize:20 }}>
                    { }
                <Text>ID: { }</Text>

            <View style={styles.container}>
                <Text>welcome to my apps!</Text>
                { !this.state.userInfo ? (<Button title="Connect with facebook" onPress={this.logInFB.bind(this)}/>) : (this._renderUserInfo())}

Here is the styling (They are both on the same file):

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    paddingTop: Constants.statusBarHeight,
    backgroundColor: '#ecf0f1',
  paragraph: {
    margin: 24,
    fontSize: 18,
    fontWeight: 'bold',
    textAlign: 'center',
    color: '#34495e',

Thanks in advance :)

Try declare your userInfo in your state this way.

        this.state = { userInfo:{} }

It's possible that your "this.state.userInfo" in this line

source={{ uri:}}

is still null, hence, where null is not an object.

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Instead of

import Expo, { Constants } from 'expo';


import { Facebook, Constants } from 'expo';

Then change

await Expo.Facebook.logInWithReadPermissionsAsync


await Facebook.logInWithReadPermissionsAsync


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From the code it's very clear that chain traversing has undefined somewhere in between.

I'm not giving the exact solution but a suggestion to avoid this type of errors known as null pointer exceptions .

Please use some simple util library like idx for traversing properties on objects.

// Using regular JavaScript 

getSourceURL = () => {
  if( this 
    && this.state 
    && this.state.userInfo 
    && this.state.userInfo.picture 
    && {

You can achieve the same using idx as below

// Using idx 

getSourceURL = () => {
  if( idx(this, _ => )) {

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Try not to set state to null anyway! You can initialize like this :

 userInfo : {
    picture: { }

According to component lifecycles constructor will execute first. Your task is asynchronous so the state will stay null till data is retrieved from server.

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  • i already using this .bind into my buttonevent, but still not work for me , onPress={this.logInFB.bind(this)}
  • Try logging the userInfo object, and checking if it has a property called 'picture'. It's possible the Facebook isn't giving you that property if a user has no picture
  • please help.. upp
  • plus 1 introducing idx.