From 5cd72f55f3cfd299583b5a4dc1a191b14d84402b Mon Sep 17 00:00:00 2001
From: Magne Sjaastad <magne.sjaastad@ceetronsolutions.com>
Date: Tue, 3 Aug 2021 14:34:51 +0200
Subject: [PATCH] #7852 Crash on dual porosity grid model load and clicking on
 cell in 3D view

---
 .../opm-flowdiagnostics-applications/opm/utility/ECLGraph.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ThirdParty/custom-opm-flowdiag-app/opm-flowdiagnostics-applications/opm/utility/ECLGraph.cpp b/ThirdParty/custom-opm-flowdiag-app/opm-flowdiagnostics-applications/opm/utility/ECLGraph.cpp
index f83a13eb24..663893a0f6 100644
--- a/ThirdParty/custom-opm-flowdiag-app/opm-flowdiagnostics-applications/opm/utility/ECLGraph.cpp
+++ b/ThirdParty/custom-opm-flowdiag-app/opm-flowdiagnostics-applications/opm/utility/ECLGraph.cpp
@@ -1233,7 +1233,9 @@ deriveNeighbours(const std::vector<std::size_t>& gcells,
             continue;
         }
 
-        if (T[globID] > 0.0) {
+        // Guard access to transmissibility vector. Crash seen in some dual porosity models
+        // https://github.com/OPM/ResInsight/issues/7852
+        if (globID < T.size() && T[globID] > 0.0) {
             const auto other = this->cells_.getNeighbour(globID, d);
 
             if ((other >= 0) && ! this->cells_.isSubdivided(other)) {