Empty Json response list in restframework

I have two models Profile and Relationship

#Serializer class
class ProfileSerializer(serializers.ModelSerializer):
    class Meta:
        model = Profile
        fields = ['first_name','last_name','bio','email','avatar']

#API view class
class ReceivedInvitesList(generics.GenericAPIView,mixins.ListModelMixin):
    serializer_class = ProfileSerializer
    def get_queryset(self):
        profile = Profile.objects.get(user=self.request.user)
        queryset = Relationship.objects.invitations_received(profile)
        return queryset

    def get(self, request):
        return self.list(request)

#Rest framework browser response
HTTP 200 OK
Allow: GET, POST, OPTIONS
Content-Type: application/json
Vary: Accept

[
    {},
    {},
    {}
]