When I open ROOT file, open tree and click on the branch with vector<TString>, ROOT crashes. Can be reproduced with following command:
root -l https://root.cern/js/files/WJets.root
root  new TBrowser
click <file> -> click tree "t;1" -> click "sparmNames" branch
Actually, all entries in tree are empty vectors.
ROOT5 shows some warning about TSubString, but works properly.