Problem with automatic range for histos

  Dear ROOT experts,

I'm trying to fit an histogram that I define with automatic range

  TH1D *hped = new TH1D("hped","hped",500,0.,0.);

if I fill it with only 500 entries, when I try to fit it, it seems to be empty. I get the error message:

Warning in <ROOT::Fit::FillData>: fit range is outside histogram range, no fit data for xaxis
Warning in <Fit>: Fit data is empty

If I fill an identical histogram with 5000 entries the fit works fine.

How can I avoid the problem in the case I have only 500 or less entries in my histogram?

In attach there is a macro reproducing this issue. I'm using ROOT v5.32.00 on 32 bit GNU/Linux

Cheers,

        Vito