From 246ab0fc914afe33ae606ad8298dd2f4682d5c13 Mon Sep 17 00:00:00 2001
From: Christopher <krzysztof.misan@cern.ch>
Date: Thu, 2 Jun 2022 19:14:58 +0200
Subject: [PATCH] Fix Sampic DQM channel_per_plane histograms

---
 DQM/CTPPS/plugins/DiamondSampicDQMSource.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/DQM/CTPPS/plugins/DiamondSampicDQMSource.cc b/DQM/CTPPS/plugins/DiamondSampicDQMSource.cc
index 68f72805e4420..0e78861951c29 100644
--- a/DQM/CTPPS/plugins/DiamondSampicDQMSource.cc
+++ b/DQM/CTPPS/plugins/DiamondSampicDQMSource.cc
@@ -546,7 +546,8 @@ void DiamondSampicDQMSource::analyze(const edm::Event &event, const edm::EventSe
           if (channelsPerPlane.find(detId_plane) != channelsPerPlane.end())
             channelsPerPlane[detId_plane]++;
           else
-            channelsPerPlane[detId_plane] = 0;
+            //if it's the first channel, create new map element with the value of 1
+            channelsPerPlane[detId_plane] = 1;
         }
 
         // Channel Plots
@@ -620,7 +621,8 @@ void DiamondSampicDQMSource::analyze(const edm::Event &event, const edm::EventSe
               if (channelsPerPlaneWithTime.find(detId_plane) != channelsPerPlaneWithTime.end())
                 channelsPerPlaneWithTime[detId_plane]++;
               else
-                channelsPerPlaneWithTime[detId_plane] = 0;
+                //if it's the first channel, create new map element with the value of 1
+                channelsPerPlaneWithTime[detId_plane] = 1;
             }
 
             if (channelPlots_.find(detId) != channelPlots_.end()) {