RooWorkspace, import Likelihood Profile issues

Dear all,
I am trying to run some code to be able to store in a RooWorkspace a RooProfileLL.

In attachment a script I modified from the tutorials which i adapted to save things to workspace.

The issue i have is that i can store it, but when I open back the file i get a segfault.

Any suggestion on what is happening/ it’s possible or not/ what I am doing wrong is more than welcome.

#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooGaussian.h"
#include "RooConstVar.h"
#include "RooAddPdf.h"
#include "RooMinimizer.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "RooPlot.h"
using namespace RooFit ;
void rf605_profilell_modified()
   // C r e a t e   m o d e l   a n d   d a t a s e t 
   // -----------------------------------------------
   // Observable
   RooRealVar x("x","x",-20,20) ;
   // Model (intentional strong correlations)
   RooRealVar mean("mean","mean of g1 and g2",0,-10,10) ;
   RooRealVar sigma_g1("sigma_g1","width of g1",3) ;
   RooGaussian g1("g1","g1",x,mean,sigma_g1) ;
   RooRealVar sigma_g2("sigma_g2","width of g2",4,3.0,6.0) ;
   RooGaussian g2("g2","g2",x,mean,sigma_g2) ;
   RooRealVar frac("frac","frac",0.5,0.0,1.0) ;
   RooAddPdf model("model","model",RooArgList(g1,g2),frac) ;
   // Generate 1000 events
   RooDataSet* data = model.generate(x,1000) ;
   // C o n s t r u c t   p l a i n   l i k e l i h o o d
   // ---------------------------------------------------
   // Construct unbinned likelihood
   RooAbsReal* nll = model.createNLL(*data) ;
   // Minimize likelihood w.r.t all parameters before making plots
   RooMinimizer mini(*nll);

   RooFitResult * fitres = ;
   // C o n s t r u c t   p r o f i l e   l i k e l i h o o d   i n   f r a c
   // -----------------------------------------------------------------------
   // The profile likelihood estimator on nll for frac will minimize nll w.r.t
   // all floating parameters except frac for each evaluation
   RooAbsReal* pll_frac = nll->createProfile(frac) ;
   // Plot the profile likelihood in frac
   // pll_frac->plotOn(frame1,LineColor(kRed)) ;
   // Adjust frame maximum for visual clarity
   // frame1->SetMinimum(0) ;
   // frame1->SetMaximum(3) ;
   // C o n s t r u c t   p r o f i l e   l i k e l i h o o d   i n   s i g m a _ g 2 
   // -------------------------------------------------------------------------------
   // The profile likelihood estimator on nll for sigma_g2 will minimize nll
   // w.r.t all floating parameters except sigma_g2 for each evaluation
   RooAbsReal* pll_sigmag2 = nll->createProfile(sigma_g2) ;

   RooWorkspace* w = new RooWorkspace("w") ;
   w->import( *data);
   w->import( model);
   w->import( *fitres);
   w->import( *nll,         RenameConflictNodes("nll"));
   w->import( *pll_sigmag2, RenameConflictNodes("pll"));

   w->writeToFile ("profiling.root",  kTRUE);


You can reproduce the issue doing

root[0] .L test.C;
root[1] rf605_profilell_modified();
root[2] TFile *f = new TFile("profiling.root");
root[3] w->Print();


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