diff --git a/webgis/js/gis.js b/webgis/js/gis.js
index 252cd0b..cbf111a 100644
--- a/webgis/js/gis.js
+++ b/webgis/js/gis.js
@@ -527,7 +527,7 @@ GIS.featurePopup = function (layerName, feature) {
             <tr><th>Anno</th><td>${feature.properties.ANNO}</td></tr>
             <tr><th>Comune</th><td>${capitalize(feature.properties.COMUNE)}</td></tr>
             <tr><th>Località</th><td>${capitalize(feature.properties.LOCALITA) ?? 'n.d.'}</td></tr>
-            <tr><th>Proprietà</th><td>${capitalize(feature.properties.PROPRIETA)}</td></tr>
+            <tr><th>Proprietà</th><td>${capitalize(feature.properties.PROPRIETA) ?? 'n.d.'}</td></tr>
             <tr><th>Foglio</th><td>${feature.properties.FOGLIO}</td></tr>
             <tr><th>Particella</th><td>${feature.properties.PART_BIS}</td></tr>
         </table>