From 9ac0a7683b02fe659406d1c81272da6a62ffff07 Mon Sep 17 00:00:00 2001
From: Slava Krutelyov <slava77@cern.ch>
Date: Fri, 24 Jul 2020 16:53:50 +0200
Subject: [PATCH] do not remake trajectories if no mtdhits were added

---
 RecoMTD/TrackExtender/plugins/TrackExtenderWithMTD.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/RecoMTD/TrackExtender/plugins/TrackExtenderWithMTD.cc b/RecoMTD/TrackExtender/plugins/TrackExtenderWithMTD.cc
index 0bdecb6578ca0..d037f00ab1acb 100644
--- a/RecoMTD/TrackExtender/plugins/TrackExtenderWithMTD.cc
+++ b/RecoMTD/TrackExtender/plugins/TrackExtenderWithMTD.cc
@@ -678,7 +678,7 @@ void TrackExtenderWithMTDT<TrackCollection>::produce(edm::Event& ev, const edm::
       thits.swap(mtdthits);
     }
 
-    const auto& trajwithmtd = theTransformer->transform(ttrack, thits);
+    const auto& trajwithmtd = mtdthits.empty() ? trajs : theTransformer->transform(ttrack, thits);
     float pMap = 0.f, betaMap = 0.f, t0Map = 0.f, sigmat0Map = -1.f, pathLengthMap = -1.f, tmtdMap = 0.f,
           sigmatmtdMap = -1.f;
     int iMap = -1;