From 132a719ad6d510d9e93cb3821ad76d0eb0bab1f9 Mon Sep 17 00:00:00 2001
From: Christopher Jones <chrisdjones15@gmail.com>
Date: Fri, 8 Jan 2021 14:41:02 -0600
Subject: [PATCH] Avoid seg fault in HTXSRivetProducer

If used in a job which processes no events, HTXSRivetProducer no
longer seg faults.
---
 .../RivetInterface/plugins/HTXSRivetProducer.cc              | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/GeneratorInterface/RivetInterface/plugins/HTXSRivetProducer.cc b/GeneratorInterface/RivetInterface/plugins/HTXSRivetProducer.cc
index 564a710855c8c..89a7bcc3558f4 100644
--- a/GeneratorInterface/RivetInterface/plugins/HTXSRivetProducer.cc
+++ b/GeneratorInterface/RivetInterface/plugins/HTXSRivetProducer.cc
@@ -163,7 +163,10 @@ void HTXSRivetProducer::produce(edm::Event& iEvent, const edm::EventSetup&) {
   }
 }
 
-void HTXSRivetProducer::endRun(edm::Run const& iRun, edm::EventSetup const& es) { _HTXS->printClassificationSummary(); }
+void HTXSRivetProducer::endRun(edm::Run const& iRun, edm::EventSetup const& es) {
+  if (_HTXS)
+    _HTXS->printClassificationSummary();
+}
 
 void HTXSRivetProducer::beginRun(edm::Run const& iRun, edm::EventSetup const& es) {
   if (_prodMode == "AUTO") {