From 4feb9c9ed9f2da6d0260b10448de96d79d0b0ef3 Mon Sep 17 00:00:00 2001
From: Michal Bluj <michal.bluj@cern.ch>
Date: Thu, 26 Oct 2017 15:19:13 +0200
Subject: [PATCH] Add protection againist missing (calo) tauId sources

---
 PhysicsTools/PatAlgos/plugins/PATTauProducer.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/PhysicsTools/PatAlgos/plugins/PATTauProducer.cc b/PhysicsTools/PatAlgos/plugins/PATTauProducer.cc
index fcbd72bbf422b..9dccbe8f70709 100755
--- a/PhysicsTools/PatAlgos/plugins/PATTauProducer.cc
+++ b/PhysicsTools/PatAlgos/plugins/PATTauProducer.cc
@@ -330,6 +330,11 @@ void PATTauProducer::produce(edm::Event & iEvent, const edm::EventSetup & iSetup
 	  edm::Handle<reco::CaloTauDiscriminator> caloTauIdDiscr;
 	  iEvent.getByToken(caloTauIDTokens_[i], caloTauIdDiscr);
 
+	  if(!caloTauIdDiscr.isValid()){
+	    edm::LogWarning("DataSource") << "Tau discriminator '" << tauIDSrcs_[i].first
+					  << "' has not been found in the event. It will not be embedded into the pat::Tau object.";
+	    continue;
+	  }
 	  ids[i].first = tauIDSrcs_[i].first;
 	  ids[i].second = getTauIdDiscriminator(caloTauCollection, idx, caloTauIdDiscr);
 	} else {