diff --git a/webgis/js/gis.js b/webgis/js/gis.js
index 45fa7e2..24e5d7d 100644
--- a/webgis/js/gis.js
+++ b/webgis/js/gis.js
@@ -140,7 +140,7 @@ GIS.buildingTechs = async function () {
         techs.addLayer(marker);
         const markerLabel = `${record.coordinates[0]} ${record.coordinates[1]}`;
         marker.options.data = record;
-        marker.options.site = record.site.label;
+        marker.options.site = record.site?.label;
         GisState.markers.buildingTechs[markerLabel] = marker;
     }
 
diff --git a/webgis/js/ui.js b/webgis/js/ui.js
index 95c4b22..5e4f871 100644
--- a/webgis/js/ui.js
+++ b/webgis/js/ui.js
@@ -277,18 +277,28 @@ UI.imageGallery = function (galleryId, items, video = false) {
  * @returns {string}
  */
 UI.createBuildingTechTable = function(record) {
-	return html`
+	let table = html`
 		<table class="table is-striped is-size-6 m-2">
 			<tbody>
 				<tr><th>Tecnica</th><td>${record.technique}</td></tr>
 				<tr><th>Descrizione</th><td>${record.description}</td></tr>
 				<tr><th>Funzione</th><td>${record.function}</td></tr>
 				<tr><th>Materiale</th><td>${record.material}</td></tr>
+	;`
+
+	if (record.site) {
+		table += html`
 				<tr><th>Sito</th><td>${record.site.label}</td></tr>
+		`;
+	}
+	
+	table += html`
 				<tr><th>Comune</th><td>${record.municipality}</td></tr>
 			</tbody>
 		</table>
-	;`
+	`;
+
+	return table;
 }
 
 export default UI;