From 033d8386fc8451ef230d3dea7e4e382303f985e0 Mon Sep 17 00:00:00 2001
From: Abraham Tishelman-Charny <abraham.tishelman.charny@cern.ch>
Date: Wed, 31 Jan 2024 02:41:35 -0500
Subject: [PATCH] Adding protection in all_invariant_masses computation

---
 analyzers/dataframe/src/JetConstituentsUtils.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/analyzers/dataframe/src/JetConstituentsUtils.cc b/analyzers/dataframe/src/JetConstituentsUtils.cc
index 0fead9fa72..f339920219 100644
--- a/analyzers/dataframe/src/JetConstituentsUtils.cc
+++ b/analyzers/dataframe/src/JetConstituentsUtils.cc
@@ -1269,6 +1269,8 @@ namespace FCCAnalyses
       
       rv::RVec<double> InvariantMasses;
 
+      if(AllJets.size() < 2) return InvariantMasses;
+
       // For each jet, take its invariant mass with the remaining jets. Stop at last jet.
       for(int i = 0; i < AllJets.size()-1; ++i) {