From 0dab2aaf2b43073afe215f766c892a723a66e5af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Atgeirr=20Fl=C3=B8=20Rasmussen?= <atgeirr@sintef.no>
Date: Mon, 20 Jun 2022 17:56:08 +0200
Subject: [PATCH] If no ACTNUM, default to all active in FieldProps.

---
 src/opm/input/eclipse/EclipseState/Grid/FieldProps.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/opm/input/eclipse/EclipseState/Grid/FieldProps.cpp b/src/opm/input/eclipse/EclipseState/Grid/FieldProps.cpp
index a6ecee19c..449634824 100644
--- a/src/opm/input/eclipse/EclipseState/Grid/FieldProps.cpp
+++ b/src/opm/input/eclipse/EclipseState/Grid/FieldProps.cpp
@@ -1212,7 +1212,12 @@ void FieldProps::scanGRIDSectionOnlyACTNUM(const GRIDSection& grid_section) {
             this->handle_keyword(keyword, box);
         }
     }
-    m_actnum = this->int_data.at("ACTNUM").data;
+    const auto iter = this->int_data.find("ACTNUM");
+    if (iter == this->int_data.end()) {
+        m_actnum.assign(this->grid_ptr->getCartesianSize(), 1);
+    } else {
+        m_actnum = iter->second.data;
+    }
 }
 
 void FieldProps::scanEDITSection(const EDITSection& edit_section) {