From 14b7f926daa519a9ec0b661053fae51b069b24d0 Mon Sep 17 00:00:00 2001
From: Vegard Kippe <vkip@equinor.com>
Date: Wed, 25 Oct 2023 09:33:47 +0200
Subject: [PATCH] Avoid looking up nonexisting nodes..

---
 opm/simulators/wells/BlackoilWellModelGeneric.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/opm/simulators/wells/BlackoilWellModelGeneric.cpp b/opm/simulators/wells/BlackoilWellModelGeneric.cpp
index 843929deb..095eef5ad 100644
--- a/opm/simulators/wells/BlackoilWellModelGeneric.cpp
+++ b/opm/simulators/wells/BlackoilWellModelGeneric.cpp
@@ -1104,8 +1104,14 @@ updateNetworkPressures(const int reportStepIdx)
         return network_imbalance;
 
     if (!previous_node_pressures.empty()) {
-        for (const auto& [name, pressure]: previous_node_pressures) {
-            const auto new_pressure = node_pressures_.at(name);
+        for (const auto& [name, new_pressure]: node_pressures_) {
+            if (previous_node_pressures.count(name) <= 0) {
+                if (std::abs(new_pressure) > network_imbalance) {
+                    network_imbalance = std::abs(new_pressure);
+                }
+                continue;
+            }
+            const auto pressure = previous_node_pressures.at(name);
             const double change = (new_pressure - pressure);
             if (std::abs(change) > network_imbalance) {
                 network_imbalance = std::abs(change);