diff --git a/lib/application.js b/lib/application.js
index f5599dd..c57d541 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -155,7 +155,6 @@ app.createContext = function(req, res){
  */
 
 app.onerror = function(err){
-  if (!err) return;
   assert(err instanceof Error, 'non-error thrown: ' + err);
 
   if (404 == err.status) return;