From e06342c5784660ef3ea78442e957eb902d15fffa Mon Sep 17 00:00:00 2001
From: Andreas Stefl <stefl.andreas@gmail.com>
Date: Mon, 26 Feb 2024 16:52:38 +0100
Subject: [PATCH] fix: Fix `TruthVertexFinder` for not reconstructed particles
 (#2979)

This fixes an overlook in https://github.com/acts-project/acts/pull/2937. Non reconstructed particles result in an exception which is fixed here
---
 .../ActsExamples/TruthTracking/TruthVertexFinder.cpp       | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Examples/Algorithms/TruthTracking/ActsExamples/TruthTracking/TruthVertexFinder.cpp b/Examples/Algorithms/TruthTracking/ActsExamples/TruthTracking/TruthVertexFinder.cpp
index 3b28a9acb57..9c73b49f267 100644
--- a/Examples/Algorithms/TruthTracking/ActsExamples/TruthTracking/TruthVertexFinder.cpp
+++ b/Examples/Algorithms/TruthTracking/ActsExamples/TruthTracking/TruthVertexFinder.cpp
@@ -151,10 +151,11 @@ ProcessCode TruthVertexFinder::execute(const AlgorithmContext& ctx) const {
   std::unordered_map<SimBarcode, std::vector<TrackIndex>> protoVertexTrackMap;
 
   for (const auto& [particle, trackMatch] : particleTrackMatching) {
-    auto vtxId =
-        SimBarcode(particle).setParticle(0).setGeneration(0).setSubParticle(0);
+    auto vtxId = SimBarcode(particle).setParticle(0).setSubParticle(0);
 
-    protoVertexTrackMap[vtxId].push_back(trackMatch.track.value());
+    if (trackMatch.track) {
+      protoVertexTrackMap[vtxId].push_back(trackMatch.track.value());
+    }
   }
 
   ProtoVertexContainer protoVertices;