diff --git a/notebook/static-src/base/js/namespace.js b/notebook/static-src/base/js/namespace.js
index 37a4a84fa..82784f707 100644
--- a/notebook/static-src/base/js/namespace.js
+++ b/notebook/static-src/base/js/namespace.js
@@ -17,6 +17,8 @@
                     configurable: false
                 });    
             }
+        }, function(err) {
+            console.warn('Jupyter.' + name + ' unavailable because "' + module_path + '" was not loaded.', err);
         });
     };
 
@@ -32,6 +34,8 @@
                     configurable: false
                 });
             }
+        }, function(err) {
+            console.warn('Jupyter.' + name + ' unavailable because "' + module_path + '" was not loaded.', err);
         });
     }