PVS-Studio warning V614 for Geant4

typedef std::vector<G4Parton *> G4PartonVector;

inline
void G4ExcitedString::InsertParton(
  G4Parton *aParton, const G4Parton * addafter)
{
  G4PartonVector::iterator insert_index;
  ....
  if ( addafter != NULL )
  {
    insert_index=std::find(thePartons.begin(),
                           thePartons.end(), addafter);
    ....
  }
  thePartons.insert(insert_index+1, aParton);
}

This suspicious code was found in Geant4 project by PVS-Studio static code analyzer.
Warning message is:
V614 Potentially uninitialized iterator 'insert_index' used. g4excitedstring.hh 193

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/