In G4LivermorePhotoElectricModel::~G4LivermorePhotoElectricModel(), the static variable fShellCrossSection is not set to NULL after deleting the instance. It causes a segmentation fault if G4LivermorePhotoElectricModel::Initialise is later called.
Thanks for your report. Could you please send us privately your application ? We'd like to reproduce the issue with your sequence. Best, Sebastien, Vladimir
Fix tagged.