diff --git a/package.json b/package.json
index eebf3aac..7d4ab933 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "csv2geojson": "5.1.1",
     "dompurify": "^3.0.3",
     "georsstogeojson": "^0.1.0",
-    "leaflet": "1.3.4",
+    "leaflet": "1.9.4",
     "leaflet-contextmenu": "^1.4.0",
     "leaflet-editable": "^1.2.0",
     "leaflet-editinosm": "0.2.3",
diff --git a/umap/static/umap/js/umap.layer.js b/umap/static/umap/js/umap.layer.js
index 212a71b2..27129f4a 100644
--- a/umap/static/umap/js/umap.layer.js
+++ b/umap/static/umap/js/umap.layer.js
@@ -1060,7 +1060,7 @@ L.U.DataLayer = L.Evented.extend({
   },
 
   isVisible: function () {
-    return this.map.hasLayer(this.layer)
+    return this.layer && this.map.hasLayer(this.layer)
   },
 
   canBrowse: function () {