fix

acts-project · Sep 30, 2024 · e1f177e · e1f177e
1 parent 913f0fd
commit e1f177e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Examples/Algorithms/Geant4/src/MaterialSteppingAction.cpp b/Examples/Algorithms/Geant4/src/MaterialSteppingAction.cpp
@@ -97,7 +97,7 @@ void ActsExamples::MaterialSteppingAction::UserSteppingAction(
   G4Track* g4Track = step->GetTrack();
   std::size_t trackID = g4Track->GetTrackID();
   auto& materialTracks = eventStore().materialTracks;
-  if (materialTracks.contains(trackID - 1)) {
+  if (!materialTracks.contains(trackID - 1)) {
     Acts::RecordedMaterialTrack rmTrack;
     const auto& g4Vertex = g4Track->GetVertexPosition();
     Acts::Vector3 vertex(g4Vertex[0], g4Vertex[1], g4Vertex[2]);