Problem 1829

Hello, 

I encounter regularly the following crash which I dont know how to address :
I am using Geant4.10.1 
Thank you
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#5  0x00002ae209d6282f in G4VoxelNavigation::ComputeStep(CLHEP::Hep3Vector const&, CLHEP::Hep3Vector const&, double, double&, G4NavigationHistory&, bool&, CLHEP::Hep3Vector&, bool&, bool&, G4VPhysicalVolume**, int&) () from /usr/local/geant4/geant4.10.1/lib64/libG4geometry.so
#6  0x00002ae209d429f3 in G4Navigator::ComputeStep(CLHEP::Hep3Vector const&, CLHEP::Hep3Vector const&, double, double&) () from /usr/local/geant4/geant4.10.1/lib64/libG4geometry.so
#7  0x00002ae20899f0e8 in G4Transportation::AlongStepGetPhysicalInteractionLength(G4Track const&, double, double, double&, G4GPILSelection*) () from /usr/local/geant4/geant4.10.1/lib64/libG4processes.so
#8  0x00002ae207834c96 in G4SteppingManager::DefinePhysicalStepLength() () from /usr/local/geant4/geant4.10.1/lib64/libG4tracking.so
#9  0x00002ae207832bef in G4SteppingManager::Stepping() () from /usr/local/geant4/geant4.10.1/lib64/libG4tracking.so
#10 0x00002ae20783d83c in G4TrackingManager::ProcessOneTrack(G4Track*) () from /usr/local/geant4/geant4.10.1/lib64/libG4tracking.so
#11 0x00002ae2075b4d2a in G4EventManager::DoProcessing(G4Event*) () from /usr/local/geant4/geant4.10.1/lib64/libG4event.so
#12 0x00002ae207351da7 in G4RunManager::ProcessOneEvent(int) () from /usr/local/geant4/geant4.10.1/lib64/libG4run.so
#13 0x00002ae207350423 in G4RunManager::DoEventLoop(int, char const*, int) () from /usr/local/geant4/geant4.10.1/lib64/libG4run.so
#14 0x00002ae20735021e in G4RunManager::BeamOn(int, char const*, int) () from /usr/local/geant4/geant4.10.1/lib64/libG4run.so
#15 0x00002ae20736b008 in G4RunMessenger::SetNewValue(G4UIcommand*, G4String) () from /usr/local/geant4/geant4.10.1/lib64/libG4run.so
#16 0x00002ae20a602112 in G4UIcommand::DoIt(G4String) () from /usr/local/geant4/geant4.10.1/lib64/libG4intercoms.so
#17 0x00002ae20a61a68e in G4UImanager::ApplyCommand(char const*) () from /usr/local/geant4/geant4.10.1/lib64/libG4intercoms.so
#18 0x00002ae20a5f12f7 in G4UIbatch::ExecCommand(G4String const&) () from /usr/local/geant4/geant4.10.1/lib64/libG4intercoms.so
#19 0x00002ae20a5f29d3 in G4UIbatch::SessionStart() () from /usr/local/geant4/geant4.10.1/lib64/libG4intercoms.so
#20 0x00002ae20a6149f3 in G4UImanager::ExecuteMacroFile(char const*) () from /usr/local/geant4/geant4.10.1/lib64/libG4intercoms.so
#21 0x00002ae20a60bcbc in G4UIcontrolMessenger::SetNewValue(G4UIcommand*, G4String) () from /usr/local/geant4/geant4.10.1/lib64/libG4intercoms.so
#22 0x00002ae20a602112 in G4UIcommand::DoIt(G4String) () from /usr/local/geant4/geant4.10.1/lib64/libG4intercoms.so
#23 0x00002ae20a61a68e in G4UImanager::ApplyCommand(char const*) () from /usr/local/geant4/geant4.10.1/lib64/libG4intercoms.so
#24 0x000000000043cef3 in main ()
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Segmentation fault