The method '[]' was called on null & receiver: null - Flutter Android

Question

There is an exception caught by widgets library, not sure whats wrong. Seems kinda issue with the Future builder here. Is that something missing like ELSE clause? Please guide. Code:

buildProfileHeader() {
    return FutureBuilder(
      future: usersRef.document(widget.profileId).get(),
      builder: (context, snapshot) {
        if (!snapshot.hasData) {
          return circularProgress();
        }
        User user = User.fromDocument(snapshot.data);
        return Padding(
          padding: EdgeInsets.all(16.0),
          child: Column(
            children: <Widget>[
              Row(
                children: <Widget>[
                  CircleAvatar(
                    radius: 40.0,
                    backgroundColor: Colors.grey,
                    backgroundImage: CachedNetworkImageProvider(user.photoUrl),
                  ),
                  Expanded(
                    flex: 1,
                    child: Column(
                      children: <Widget>[
                        Row(
                          mainAxisSize: MainAxisSize.max,
                          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                          children: <Widget>[
                            buildCountColumn("Videos", postCount),
                            buildCountColumn("Followers", 0),
                            buildCountColumn("Following", 0),
                          ],
                        ),
                        Row(
                          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                          children: <Widget>[buildProfileButton()],
                        ),
                      ],
                    ),
                  ),
                ],
              ),
              Container(
                alignment: Alignment.centerLeft,
                padding: EdgeInsets.only(top: 12.0),
                child: Text(
                  user.username,
                  style: TextStyle(
                    fontWeight: FontWeight.bold,
                    fontSize: 16.0,
                  ),
                ),
              ),
              Container(
                alignment: Alignment.centerLeft,
                padding: EdgeInsets.only(top: 4.0),
                child: Text(
                  user.displayName,
                  style: TextStyle(
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
              Container(
                alignment: Alignment.centerLeft,
                padding: EdgeInsets.only(top: 2.0),
                child: Text(
                  user.bio,
                ),
              ),
            ],
          ),
        );
      },
    );
  }

The debug console shows: The method '[]' was called on null. Receiver: null Tried calling: The relevant error-causing widget was FutureBuilder

Even though, the buildProfileButton() is also in place above the buildProfileHeader():

buildProfileButton() {
    bool isProfileOwner = currentUserId == widget.profileId;
    if (isProfileOwner) {
      return buildButton(text: "Edit Profile", function: editProfile);
    }
  }

Answer 1

As can be seen in your buildProfileButton() function it will not return anything if condition is false. So you have to return something.

Return empty container at the end could be best solution.