diff --git a/ui-ngx/src/app/modules/home/components/widget/lib/maps/leaflet-map.ts b/ui-ngx/src/app/modules/home/components/widget/lib/maps/leaflet-map.ts
index 8ee031d433..a1280fef13 100644
--- a/ui-ngx/src/app/modules/home/components/widget/lib/maps/leaflet-map.ts
+++ b/ui-ngx/src/app/modules/home/components/widget/lib/maps/leaflet-map.ts
@@ -345,8 +345,8 @@ export default abstract class LeafletMap {
 
     updatePolylines(polyData: FormattedData[][], data?: FormattedData) {
         polyData.forEach((dataSource) => {
-            data = data || dataSource[0];
             if (dataSource.length) {
+                data = data || dataSource[0];
                 if (this.polylines.get(data.$datasource.entityName)) {
                     this.updatePolyline(data, dataSource, this.options);
                 }