- friendTrack0 = esdFriend->GetTrack(v0->GetIndex(0)); //this guy can be NULL
- friendTrack1 = esdFriend->GetTrack(v0->GetIndex(1)); //this guy can be NULL
+ Int_t ntracksFriend = esdFriend->GetNumberOfTracks();
+ if (v0->GetIndex(0)<ntracksFriend){
+ friendTrack0 = esdFriend->GetTrack(v0->GetIndex(0)); //this guy can be NULL
+ }
+ if (v0->GetIndex(1)<ntracksFriend){
+ friendTrack1 = esdFriend->GetTrack(v0->GetIndex(1)); //this guy can be NULL
+ }