title: error: The operator '[]' isn't defined for the type 'Object'
body: <p>I have error in here :  <code>image:NetworkImage(cars.docs[i].data()[&quot;imagePro&quot;]</code>  do you know how to fix this error? I want to get profile picture from firebase to show on page, I tried this :<code>image:NetworkImage(cars.docs[i].data()[&quot;imagePro&quot;] ?? '' </code> but it doesn't work!!!
  part of the code:</p>
  <pre><code>Map&lt;String , dynamic&gt; carData = {
                      'imagePro': userImageUrl,
                      };
  
  Widget build(BuildContext context) {
  Widget showCarsList(){
        if (cars != null){
          return ListView.builder(
              itemCount: cars.docs.length,
            itemBuilder: (context , i){
                return Card(
                  child: Column(
                    children: [
                      ListTile(
                        leading: GestureDetector(
                          child: Container(
                            decoration: BoxDecoration(
                              shape: BoxShape.circle,
                              image: DecorationImage(
                                image: NetworkImage(cars.docs[i].data()[&quot;imagePro&quot;],),
                              ),
                            ),
                          ),
                        ),
                      ),
                    ],
                  ),
                );
            },
          );
        }
      }
  }
  </code></pre>