Attempt to read property "name" on null

Hi Guys. I'm trying to get the role and client name on the user's list but I get an error stating "Attempt to read property "name" on null". Below's my code:

@foreach($users as $user)
<tr>
    <td>{{ $user->firstname }}</td>
    <td>{{ $user->lastname }}</td>
    <td>{{ $user->email }}</td>
    <td>{{ $user->client->name }}</td>
    <td><span class="badge badge-success">{{ $user->role->name }}</span></td>
</tr>
@endforeach

My User model is like this:

    use HasApiTokens, HasFactory, Notifiable, HasRoles;

    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'firstname',
        'lastname',
        'email',
        'password',
        'client_id'
    ];

    public function client()
    {
        return $this->belongsTo(Client::class);
    }

User Controller

    public function index()
    {
        $users = User::with('roles', 'client')->get();
        return view('system.users.index', compact('users'));
    }

Then migration

            $table->foreignId('client_id')->nullable();

I'm not sure as to what I'm missing.