From 61a8f90adfbf5aaae051daa7548f562af0ea8636 Mon Sep 17 00:00:00 2001
From: Valeria D'Amante <valeriadamante@gmail.com>
Date: Thu, 11 Nov 2021 14:32:06 +0100
Subject: [PATCH] fixed issue with nv==0

code checks
---
 RecoTauTag/HLTProducers/src/L2TauTagNNProducer.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/RecoTauTag/HLTProducers/src/L2TauTagNNProducer.cc b/RecoTauTag/HLTProducers/src/L2TauTagNNProducer.cc
index 93c6e10e56ca7..47c40da4fd7d7 100644
--- a/RecoTauTag/HLTProducers/src/L2TauTagNNProducer.cc
+++ b/RecoTauTag/HLTProducers/src/L2TauTagNNProducer.cc
@@ -572,6 +572,8 @@ std::vector<int> L2TauNNProducer::selectGoodVertices(const ZVertexSoA& patavtx_s
   auto maxTracks = patatracks_tsoa.stride();
   const int nv = patavtx_soa.nvFinal;
   std::vector<int> VtxGood;
+  if (nv == 0)
+    return VtxGood;
   VtxGood.reserve(nv);
 
   std::vector<double> maxChi2_;