From 61bdde1c1e04533d30b2de036a49e9f676073b1b Mon Sep 17 00:00:00 2001
From: marco aparo <aparo.marco@gmail.com>
Date: Wed, 9 Oct 2024 19:43:48 +0200
Subject: [PATCH] bug fix

---
 .../InDetTrackPerfMon/src/plots/TrackParametersPlots.cxx        | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/InnerDetector/InDetValidation/InDetTrackPerfMon/src/plots/TrackParametersPlots.cxx b/InnerDetector/InDetValidation/InDetTrackPerfMon/src/plots/TrackParametersPlots.cxx
index 38a8e9064b86..0fbbeeedec43 100644
--- a/InnerDetector/InDetValidation/InDetTrackPerfMon/src/plots/TrackParametersPlots.cxx
+++ b/InnerDetector/InDetValidation/InDetTrackPerfMon/src/plots/TrackParametersPlots.cxx
@@ -89,7 +89,7 @@ StatusCode IDTPM::TrackParametersPlots::fillPlots(
   float pnSiHits = nSiHits( particle );
   float pchi2 = chiSquared( particle );
   float pndof = ndof( particle );
-  float pchi2OverNdof = pchi2 / pndof;
+  float pchi2OverNdof = ( pndof > 0 ) ? pchi2 / pndof : 0.;
   std::vector< unsigned int > pauthor = author( particle );
 
   /// Fill the histograms
-- 
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