diff --git a/ApplicationLibCode/ReservoirDataModel/RigContourMapCalculator.cpp b/ApplicationLibCode/ReservoirDataModel/RigContourMapCalculator.cpp
index 29c13ab512..3d435cc8b1 100644
--- a/ApplicationLibCode/ReservoirDataModel/RigContourMapCalculator.cpp
+++ b/ApplicationLibCode/ReservoirDataModel/RigContourMapCalculator.cpp
@@ -360,7 +360,7 @@ std::vector<RigContourMapCalculator::CellIndexAndResult>
     auto cellGridIdxVisibility = contourMapProjection.getCellVisibility();
     for ( size_t globalCellIdx : allCellIndices )
     {
-        if ( ( *cellGridIdxVisibility )[globalCellIdx] )
+        if ( cellGridIdxVisibility.isNull() || ( *cellGridIdxVisibility )[globalCellIdx] )
         {
             kLayerIndexMap[contourMapProjection.kLayer( globalCellIdx )].push_back( globalCellIdx );
         }