diff --git a/Tr/TrackMonitors/src/VertexCompare.cpp b/Tr/TrackMonitors/src/VertexCompare.cpp
index 9999182ece965c923344065adaf824046002363f..ad1d17e24125d66e9f8127b0a78379dd9e2425e6 100644
--- a/Tr/TrackMonitors/src/VertexCompare.cpp
+++ b/Tr/TrackMonitors/src/VertexCompare.cpp
@@ -246,12 +246,15 @@ private:
   mutable Gaudi::Accumulators::SumAccumulator<Gaudi::Accumulators::atomicity::full, double>  m_stat_pullz_fourth_sum;
 
   struct monitoringHistos {
-    mutable std::array<Gaudi::Accumulators::Histogram<1>, 5> m_histo_nTracksBins_dx;
-    mutable std::array<Gaudi::Accumulators::Histogram<1>, 5> m_histo_nTracksBins_dy;
-    mutable std::array<Gaudi::Accumulators::Histogram<1>, 5> m_histo_nTracksBins_dz;
+    mutable std::array<Gaudi::Accumulators::Histogram<1>, 6> m_histo_nTracksBins_dx;
+    mutable std::array<Gaudi::Accumulators::Histogram<1>, 6> m_histo_nTracksBins_dy;
+    mutable std::array<Gaudi::Accumulators::Histogram<1>, 6> m_histo_nTracksBins_dz;
     mutable Gaudi::Accumulators::Histogram<1>                m_histo_pullx_Monitoring;
     mutable Gaudi::Accumulators::Histogram<1>                m_histo_pully_Monitoring;
     mutable Gaudi::Accumulators::Histogram<1>                m_histo_pullz_Monitoring;
+    mutable Gaudi::Accumulators::Histogram<1>                m_histo_pullx_overflow_nTracBin_Monitoring;
+    mutable Gaudi::Accumulators::Histogram<1>                m_histo_pully_overflow_nTracBin_Monitoring;
+    mutable Gaudi::Accumulators::Histogram<1>                m_histo_pullz_overflow_nTracBin_Monitoring;
 
     template <std::size_t... IDXs>
     static std::array<Gaudi::Accumulators::Histogram<1>, sizeof...( IDXs )>
@@ -266,16 +269,26 @@ private:
     monitoringHistos( const VertexCompare* owner )
         : m_histo_nTracksBins_dx{ histo1DArrayBuilder( owner, "dx_Monitoring_ntracks_bin",
                                                        Gaudi::Histo1DDef{ "dx, mm", -0.15, 0.15, 50 },
-                                                       std::make_index_sequence<5>() ) }
+                                                       std::make_index_sequence<6>() ) }
         , m_histo_nTracksBins_dy{ histo1DArrayBuilder( owner, "dy_Monitoring_ntracks_bin",
                                                        Gaudi::Histo1DDef{ "dy, mm", -0.15, 0.15, 50 },
-                                                       std::make_index_sequence<5>() ) }
+                                                       std::make_index_sequence<6>() ) }
         , m_histo_nTracksBins_dz{ histo1DArrayBuilder( owner, "dz_Monitoring_ntracks_bin",
                                                        Gaudi::Histo1DDef{ "dz, mm", -1.5, 1.5, 50 },
-                                                       std::make_index_sequence<5>() ) }
+                                                       std::make_index_sequence<6>() ) }
         , m_histo_pullx_Monitoring{ owner, "pullx_Monitoring", "pull x", { 20, -5, 5 } }
         , m_histo_pully_Monitoring{ owner, "pully_Monitoring", "pull y", { 20, -5, 5 } }
-        , m_histo_pullz_Monitoring{ owner, "pullz_Monitoring", "pull z", { 20, -5, 5 } } {}
+        , m_histo_pullz_Monitoring{ owner, "pullz_Monitoring", "pull z", { 20, -5, 5 } }
+        , m_histo_pullx_overflow_nTracBin_Monitoring{ owner,
+                                                      "pullx_overflow_nTracBin_Monitoring",
+                                                      "pull x",
+                                                      { 20, -5, 5 } }
+        , m_histo_pully_overflow_nTracBin_Monitoring{ owner,
+                                                      "pully_overflow_nTracBin_Monitoring",
+                                                      "pull y",
+                                                      { 20, -5, 5 } }
+        , m_histo_pullz_overflow_nTracBin_Monitoring{
+              owner, "pullz_overflow_nTracBin_Monitoring", "pull z", { 20, -5, 5 } } {}
   };
   std::unique_ptr<monitoringHistos> m_monitoringHistos;
 
@@ -498,13 +511,23 @@ void VertexCompare::operator()( Vertices const& recoVtx1, Vertices const& recoVt
             if ( std::lround( ( ntracks1 + ntracks2 ) / 2 ) <= ntrack_bins[i] ) { break; }
             binCount++;
           }
-          auto& monitoringHistos = *m_monitoringHistos.get();
-          ++monitoringHistos.m_histo_nTracksBins_dx[binCount][dx];
-          ++monitoringHistos.m_histo_nTracksBins_dy[binCount][dy];
-          ++monitoringHistos.m_histo_nTracksBins_dz[binCount][dz];
-          ++monitoringHistos.m_histo_pullx_Monitoring[pullx];
-          ++monitoringHistos.m_histo_pully_Monitoring[pully];
-          ++monitoringHistos.m_histo_pullz_Monitoring[pullz];
+          if ( binCount < 5 ) {
+            auto& monitoringHistos = *m_monitoringHistos.get();
+            ++monitoringHistos.m_histo_nTracksBins_dx[binCount][dx];
+            ++monitoringHistos.m_histo_nTracksBins_dy[binCount][dy];
+            ++monitoringHistos.m_histo_nTracksBins_dz[binCount][dz];
+            ++monitoringHistos.m_histo_pullx_Monitoring[pullx];
+            ++monitoringHistos.m_histo_pully_Monitoring[pully];
+            ++monitoringHistos.m_histo_pullz_Monitoring[pullz];
+          } else {
+            auto& monitoringHistos = *m_monitoringHistos.get();
+            ++monitoringHistos.m_histo_nTracksBins_dx[5][dx];
+            ++monitoringHistos.m_histo_nTracksBins_dy[5][dy];
+            ++monitoringHistos.m_histo_nTracksBins_dz[5][dz];
+            ++monitoringHistos.m_histo_pullx_overflow_nTracBin_Monitoring[pullx];
+            ++monitoringHistos.m_histo_pullx_overflow_nTracBin_Monitoring[pully];
+            ++monitoringHistos.m_histo_pullx_overflow_nTracBin_Monitoring[pullz];
+          }
         }
       }
       if ( m_produceHistogram.value() || m_monitoring.value() ) {