From 66c4ad50f92decd99503bd5511effda65c3c21b1 Mon Sep 17 00:00:00 2001
From: shahoian <ruben.shahoyan@cern.ch>
Date: Mon, 4 May 2026 17:55:10 +0200
Subject: [PATCH] Check for streamer presence before writing the output

---
 Detectors/GlobalTrackingWorkflow/study/src/CheckResidSpec.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Detectors/GlobalTrackingWorkflow/study/src/CheckResidSpec.cxx b/Detectors/GlobalTrackingWorkflow/study/src/CheckResidSpec.cxx
index 6f3055aa00806..ff73be857346f 100644
--- a/Detectors/GlobalTrackingWorkflow/study/src/CheckResidSpec.cxx
+++ b/Detectors/GlobalTrackingWorkflow/study/src/CheckResidSpec.cxx
@@ -325,7 +325,9 @@ void CheckResidSpec::process()
   // output
   for (const auto& accum : slots) {
     for (const auto& tr : accum) {
-      (*mDBGOut) << "res" << "tr=" << tr << "\n";
+      if (mDBGOut) {
+        (*mDBGOut) << "res" << "tr=" << tr << "\n";
+      }
       if (mHMan) {
         fillHistos(tr);
       }