diff --git a/RecoVertex/PrimaryVertexProducer/src/DAClusterizerInZT_vect.cc b/RecoVertex/PrimaryVertexProducer/src/DAClusterizerInZT_vect.cc
index 61ef41b672e80..fd9c4c4a61423 100644
--- a/RecoVertex/PrimaryVertexProducer/src/DAClusterizerInZT_vect.cc
+++ b/RecoVertex/PrimaryVertexProducer/src/DAClusterizerInZT_vect.cc
@@ -262,8 +262,12 @@ DAClusterizerInZT_vect::track_t DAClusterizerInZT_vect::fill(const vector<reco::
     sumtkwt += t_tkwt;
   }
 
-  tks.extractRaw();
-  tks.osumtkwt = sumtkwt > 0 ? 1. / sumtkwt : 0.;
+  if (sumtkwt > 0) {
+    tks.extractRaw();
+    tks.osumtkwt = 1. / sumtkwt;
+  } else {
+    tks.osumtkwt = 0.;
+  }
 
 #ifdef DEBUG
   if (DEBUGLEVEL > 0) {