From ecc4d6206f5d169d68fe3f98c14804193f890b99 Mon Sep 17 00:00:00 2001
From: mmusich <marco.musich@cern.ch>
Date: Thu, 14 Sep 2023 17:37:02 +0200
Subject: [PATCH] add protection against missing input collections in
 Phase2IT{OT}MonitorCluster

---
 DQM/SiTrackerPhase2/plugins/Phase2ITMonitorCluster.cc | 6 ++++++
 DQM/SiTrackerPhase2/plugins/Phase2OTMonitorCluster.cc | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/DQM/SiTrackerPhase2/plugins/Phase2ITMonitorCluster.cc b/DQM/SiTrackerPhase2/plugins/Phase2ITMonitorCluster.cc
index 54d7ab6e8d1d0..f58172a12aa5a 100644
--- a/DQM/SiTrackerPhase2/plugins/Phase2ITMonitorCluster.cc
+++ b/DQM/SiTrackerPhase2/plugins/Phase2ITMonitorCluster.cc
@@ -102,6 +102,12 @@ void Phase2ITMonitorCluster::dqmBeginRun(const edm::Run& iRun, const edm::EventS
 void Phase2ITMonitorCluster::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup) {
   // Getting the clusters
   const auto& itPixelClusterHandle = iEvent.getHandle(itPixelClusterToken_);
+
+  if (!itPixelClusterHandle.isValid()) {
+    edm::LogWarning("Phase2ITMonitorCluster") << "No SiPixelCluster Collection found in the event. Skipping!";
+    return;
+  }
+
   // Number of clusters
   std::map<std::string, unsigned int> nClsmap;
   unsigned int nclusGlobal = 0;
diff --git a/DQM/SiTrackerPhase2/plugins/Phase2OTMonitorCluster.cc b/DQM/SiTrackerPhase2/plugins/Phase2OTMonitorCluster.cc
index 9c890fe79b52e..8b190388aba3b 100644
--- a/DQM/SiTrackerPhase2/plugins/Phase2OTMonitorCluster.cc
+++ b/DQM/SiTrackerPhase2/plugins/Phase2OTMonitorCluster.cc
@@ -105,6 +105,12 @@ void Phase2OTMonitorCluster::dqmBeginRun(const edm::Run& iRun, const edm::EventS
 void Phase2OTMonitorCluster::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup) {
   // Getting the clusters
   const auto& clusterHandle = iEvent.getHandle(clustersToken_);
+
+  if (!clusterHandle.isValid()) {
+    edm::LogWarning("Phase2OTMonitorCluster") << "No Phase2TrackerCluster1D Collection found in the event. Skipping!";
+    return;
+  }
+
   // Number of clusters
   std::map<std::string, unsigned int> nClustersCounter_P;  //map of detidkey vs #cls
   std::map<std::string, unsigned int> nClustersCounter_S;  //map of detidkey vs #cls