diff --git a/umap/static/umap/js/umap.js b/umap/static/umap/js/umap.js
index 48944b51b..b65e85bb1 100644
--- a/umap/static/umap/js/umap.js
+++ b/umap/static/umap/js/umap.js
@@ -621,6 +621,7 @@ L.U.Map.include({
         this.setZoom(this.selected_tilelayer.options.maxZoom)
       }
     } catch (e) {
+      console.error(e)
       this.removeLayer(tilelayer)
       this.ui.alert({
         content: `${L._('Error in the tilelayer URL')}: ${tilelayer._url}`,