diff --git a/lib/www/client/source/src/views/Map.vue b/lib/www/client/source/src/views/Map.vue
index cacb743..f3aa989 100644
--- a/lib/www/client/source/src/views/Map.vue
+++ b/lib/www/client/source/src/views/Map.vue
@@ -521,9 +521,9 @@ export default {
 
               l.layer.lastRequestURL = url;
             } else {
-              console.warn(`Too much data from ${url} (${layer.features.length ?? layer.length} ≥ ${limit} features)`);
+              console.warn(`Too much data from ${url} (${layer.features?.length ?? layer.length} ≥ ${limit} features)`);
 
-              this.showSnack([`Layer ‘${l.layer.options.userLayerName}’ is too large: ${layer.features.length ?? layer.length} features; maximum is ${limit}`, "error"]);
+              this.showSnack([`Layer ‘${l.layer.options.userLayerName}’ is too large: ${layer.features?.length ?? layer.length} features; maximum is ${limit}`, "error"]);
             }
           })
           .finally( () => {