fix crash

cms-sw · Aug 23, 2021 · 838904e · 838904e
1 parent 3c78672
commit 838904e
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/CommonTools/RecoAlgos/src/PrimaryVertexAssignment.cc b/CommonTools/RecoAlgos/src/PrimaryVertexAssignment.cc
@@ -67,7 +67,9 @@ std::pair<int, PrimaryVertexAssignment::Quality> PrimaryVertexAssignment::charge
     }
   }
 
-  auto firstVertexDz = std::abs(track->dz(vertices.at(0).position()));
+  double firstVertexDz = std::numeric_limits<double>::max();
+  if (vertices.size() > 0)
+    firstVertexDz = std::abs(track->dz(vertices.at(0).position()));
   // recover cases where the primary vertex is split
   if (useVertexFit_ && (iVertex > 0) && (iVertex <= fNumOfPUVtxsForCharged_) &&
       firstVertexDz < fDzCutForChargedFromPUVtxs_)