In G4VUserTrackInformation(), pType is initialized as NULL. Then in G4VUserTrackInformation(const G4VUserTrackInformation& right), *(right.pType) is used to copy pType. It cause a crash when right.pType is NULL, namely when a user does not allocate and set pType in the user code.
Thank you for reporting the problem. The bug will be fixed in the next patch and releases.