diff --git a/lib/application.js b/lib/application.js
index 9cf68d8..878c7a5 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -163,7 +163,7 @@ app.createContext = function(req, res){
 app.onerror = function(err){
   assert(err instanceof Error, 'non-error thrown: ' + err);
 
-  if (404 == err.status) return;
+  if (404 == err.status || err.expose) return;
   if ('test' == this.env) return;
 
   var msg = err.stack || err.toString();