Aborting of calculation when World is AIR

Physics Processes, Models and Cross Sections
1

I’m using 18MeV protons as primary particles. I set next values for cuts:

void PhysicsList::SetCuts()
{
SetCutValue(1mm, “proton”);
SetCutValue(mm, “e-”);
SetCutValue(1mm, “e+”);
SetCutValue(1mm, “gamma”);
}

When World material is G4_Galactic there is anything OK. But when I set it to G4_AIR the running aborted. What’s the problem ?

_Geant4 Version:_v11.0.2
_Operating System:_Ubuntu 22.04
_Compiler/Version:_gcc 11.4.0
_CMake Version:_3.22.1