AttributeError at /api/list/ 'NoneType' object has no attribute 'delete'

Question

class StatusListSearchApi(mixins.CreateModelMixin,
    mixins.RetrieveModelMixin,
    mixins.UpdateModelMixin,
    mixins.DestroyModelMixin,
    ListAPIView):

    # queryset=status.objects.all()
    serializer_class=statusSerializer
    lookup_field='id'
        # return Response(serializer.datax)
    def get_queryset(self):
        request=self.request
        qs=status.objects.all()
        query=request.GET.get('q')
        if query is not None:
            qs=qs.filter(content__icontains=query)
        return qs

    def get_object(self):
        request=self.request
        passed_id=request.GET.get('id',None)
        queryset=self.get_queryset()
        obj=None
        if passed_id is not None:
            obj=get_object_or_404(queryset,id=passed_id)
            self.check_object_permissions(request,obj)
    def get(self,request,*args,**kwargs):
        passed_id=request.GET.get('id',None)
        if passed_id is not None:
            return self.retrieve(request,*args,**kwargs)
        return super().get(request,*args,**kwargs)
    def post(self,request,*args,**kwargs):
        return self.create(request,*args,**kwargs)
    def put(self,request,*args,**kwargs):
        return self.update(request,*args,**kwargs)
    def patch(self,request,*args,**kwargs):
        return self.update(request,*args,**kwargs)

    def delete(self,request,*args,**kwargs):
        return self.destroy(request,*args,**kwargs)

I have tried to use the mixin serializer to serialize but when I tried to use delete in my browsable api, I got stuck with an error:

AttributeError at /api/list/ 'NoneType' object has no attribute 'delete'

Creating and retrieving is working fine, but update and delete aren't working.

I don't know what the issue is....

Any kind of help is appreciated