Fully filled THnSparse cannot do 3D projection

ROOT
1

I am getting following error when i want to do 3D projection on fully filled THnSparse object

$ root m.C                                                                                                                                                                                                                                                                                           
root [0]                                                                                                                                                                                                                                                                                                                       
Processing m.C...                                                                                                                                                                                                                                                                                                              
Info in <TCanvas::MakeDefCanvas>:  created default TCanvas with name c1                                                                                                                                                                                                                                                        
/usr/include/c++/15/bits/stl_vector.h:1262: std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](size_type) [with _Tp = double; _Alloc = std::allocator<double>; reference = double&; size_type = long unsigned int]: Assertion '__n < this->size()' failed.

Macro is here

void m() {
  Int_t point[3] = {1, 1, 1};
  Int_t bins[3] = {1, 1, 2};
  Double_t mins[3] = {0, 0, 0};
  Double_t maxs[3] = {10, 10, 10};
  THnSparse *s = new THnSparseC("s", "sss", 3, bins, mins, maxs);
  s->SetBinContent(s->GetBin(point), 1);
  point[0] = 1;
  point[1] = 1;
  point[2] = 2;
  // comment this line and it will work ok.
  s->SetBinContent(s->GetBin(point), 1);
  s->Projection(0, 1, 2)->Draw();
}

ROOT Version: 6.34.06
Platform: linuxx8664gcc
Compiler: g++ (GCC) 15.0.1 20250228 (Red Hat 15.0.1-0)

2

With root 6.32.12 on Linux Mint I get the plot below and no errors:

c1
c1698×476 6.5 KB

In your case it could be some bug in the dev version, which may get sorted out, but if you need it now, try the latest stable version instead, or the newer one from 6.34 (08 now).